Table of Contents
QNAP TS-251D User Manual
Displayed below is the user manual for TS-251D by QNAP which is a product in the NAS & Storage Servers category. This manual has pages.
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TS-251D
User Guide
Document Version: 1
13/01/2020
Contents
1. Preface
About This Guide.......................................................................................................................................... 3
Audience.......................................................................................................................................................3
Document Conventions................................................................................................................................ 3
2. Product Overview
About the TS-251D....................................................................................................................................... 4
Hardware Specifications............................................................................................................................... 4
Package Contents........................................................................................................................................ 6
Components................................................................................................................................................. 7
Front Panel...............................................................................................................................................7
Left Panel................................................................................................................................................. 8
Rear Panel................................................................................................................................................8
Drive Numbering.......................................................................................................................................9
Installation Requirements............................................................................................................................. 9
Setting Up the NAS.......................................................................................................................................9
3. Installation and Configuration
Hardware Installation.................................................................................................................................. 11
Drive Installation..................................................................................................................................... 11
Installing Expansion Cards.....................................................................................................................19
Replacing Memory Modules...................................................................................................................25
QTS Installation.......................................................................................................................................... 30
Installing QTS Using Qfinder Pro........................................................................................................... 31
Installing QTS Using the Cloud Key....................................................................................................... 32
Installing QTS Using an HDMI Connection............................................................................................ 33
4. Basic Operations
Power Button.............................................................................................................................................. 35
Reset Button............................................................................................................................................... 35
USB One Touch Copy Button..................................................................................................................... 35
LEDs........................................................................................................................................................... 36
Audio Alert.................................................................................................................................................. 37
5. Troubleshooting
Forcing Qfinder Pro or myQNAPcloud to Locate the NAS......................................................................... 38
Hot-Swapping Failed Drives....................................................................................................................... 38
Recovering Unintentionally Removed Healthy Drives................................................................................ 38
Support and Other Resources.................................................................................................................... 39
6. Glosssary
CloudKey.................................................................................................................................................... 40
myQNAPcloud Link.....................................................................................................................................40
myQNAPcloud............................................................................................................................................ 40
myQNAPcloud ID........................................................................................................................................40
Qfinder Pro................................................................................................................................................. 40
QTS.............................................................................................................................................................40
7. Notices
Limited Warranty.........................................................................................................................................41
TS-251D User Guide
1
Disclaimer................................................................................................................................................... 41
GNU Public License....................................................................................................................................41
CE Notice....................................................................................................................................................49
FCC Notice................................................................................................................................................. 49
VCCI Notice................................................................................................................................................ 50
BSMI Notice................................................................................................................................................50
SJ/T 11364-2006.........................................................................................................................................50
2
1. Preface
About This Guide
This guide provides information on the QNAP TS-251D NAS and step-by-step instructions on installing the
hardware. It also provides instructions on basic operations and troubleshooting information.
Audience
This document is intended for consumers and storage administrators. This guide assumes that the user has
a basic understanding of storage and backup concepts.
Document Conventions
Symbol Description
Notes provide default configuration settings and other supplementary
information.
Important notes provide information on required configuration settings and other
critical information.
Tips provide recommendations or alternative methods of performing tasks or
configuring settings.
Warnings provide information that, when ignored, may result in potential loss,
injury, or even death.
TS-251D User Guide
Preface 3
2. Product Overview
This chapter provides basic information about the QNAP TS-251D NAS.
About the TS-251D
The TS-251D is powered by an Intel® Celeron® J4005 dual-core 2.0 GHz processor with burst frequency up
to 2.7 GHz. The TS-251D supports up to 8 GB of DDR4 RAM and features USB One Touch Copy, a Gigabit
LAN port, and a PCIe slot. With Intel® AES-NI 256 hardware-accelerated encryption engine, the TS-251D
ensures the security of sensitive data and protects important information stored on the NAS.
Hardware Specifications
Warning
• If your QNAP product has hardware defects, return the product to QNAP or a QNAP-
authorized service center for maintenance or replacement. Any attempt to repair or
perform maintenance procedures on the product by you or an unauthorized third-party
invalidates the warranty.
• QNAP is not responsible for any damage or data loss caused by unauthorized
modifications and installation of unsupported third-party applications.
For details, see the QNAP Warranty Terms and Conditions.
Ordering P/N CPU Memory Power supply
TS-251D-2G Intel® Celeron® J4005 2 GB Single
TS-251D-4G Intel® Celeron® J4005 4 GB Single
Component TS-251D-2G TS-251D-4G
Processor
CPU Intel® Celeron® J4005
Frequency Dual-core/2-thread 2.0 GHz base/2.7 GHz burst
Architecture x86 64-bit
Encryption engine AES-NI
Memory
Pre-installed memory 2 GB RAM: 1 x 2 GB SODIMM
DDR4
4 GB RAM: 1 x 4 GB SODIMM
DDR4
Memory slots 2 x SODIMM DDR4
Important
• Use only QNAP memory modules to maintain
system performance and stability. For NAS devices
with more than one memory slot, use QNAP
modules with identical specifications.
• Using unsupported modules may degrade
performance, cause errors, or prevent the
operating system from starting.
Maximum memory 8 GB RAM: 2 x 4 GB
Flash memory 4 GB (Dual-boot OS protection)
TS-251D User Guide
Product Overview 4
Component TS-251D-2G TS-251D-4G
Storage
Drive bays 2 x 3.5-inch SATA 6 Gbps
Tip
The drive bays are backward compatible with 3.5-inch
SATA 3 Gbps drives.
Drive compatibility 3.5-inch bays:
• 3.5-inch SATA hard disk drives
• 2.5-inch SATA hard disk drives
• 2.5-inch SATA solid-state drives
SSD cache acceleration support 3.5-inch drive bays 1 to 2
Hot-swapping Supported
Network
Gigabit Ethernet ports 1 x GbE RJ45
External I/O Ports & Expansion Slots
PCIe slots 1 x PCIe 2.0 x4
Tip
For the list of compatible expansion cards, go to
https://www.qnap.com/compatibility.
USB ports Front:
1 x USB 3.0 Type-A
Note
This USB port supports One Touch Copy.
Rear:
• 3 x USB 2.0 Type-A
• 1 x USB 3.0 Type-A
HDMI ports 1 x HDMI 2.0 (up to 3840 x 2160 resolution at 60Hz)
Interface
IR sensor 1
Note
The QNAP RM-IR004 remote control is an optional
separate purchase.
Buttons • Power
• Reset
• USB One Touch Copy
Dimensions
Form factor Tower
Dimensions (H x W x D) 168 x 105 x 226 mm
(6.61 x 4.13 x 8.90 in)
TS-251D User Guide
Product Overview 5
Component TS-251D-2G TS-251D-4G
Net weight 1.48 kg (3.26 lbs)
Others
Power supply unit 65W, 100-240V AC, 50/60 Hz
Warning
To reduce the risk of fire or electric shock, ensure that
you only connect the power cord to a properly
grounded electrical outlet.
System battery CR2032 lithium battery (3V, 225 mAh)
Warning
To avoid potential battery explosion, causing injury or
damage to components, ensure that you replace the
existing battery with a battery of the same type.
Important
Dispose of used batteries according to local
regulations or the instructions of the battery
manufacturer.
Sound level 16.7 db(A)
Note
The sound level was tested at a bystander position,
which is within one meter of the NAS. The test NAS
operated at low speed with the maximum number of
drives installed.
Fans System: 1 x 70 mm, 12V DC fan
Warning
To avoid potential injury or damage to components, do
not touch the fans while the NAS is connected to a
power source.
Operating temperature 0˚C to 40˚C (32˚F to 104˚F)
Relative humidity • Non-condensing relative humidity: 5% to 95%
• Wet-bulb temperature: 27˚C (80.6˚F)
Tip
Model specifications are subject to change without prior notice. To see the latest
specifications, go to https://www.qnap.com.
Package Contents
Item Quantity
TS-251D 1
AC power adapter 1
Power cord 1
Ethernet cable Cat5e cable: 1
Screws for 3.5-inch drives 8
TS-251D User Guide
Product Overview 6
Item Quantity
Screws for 2.5-inch drives 6
Quick Installation Guide (QIG) 1
Components
Front Panel
No. Component No. Component
1 Power button 5 Drive 1 LED
2 Status LED 6 Drive 2 LED
3 LAN LED 7 USB 3.0 One Touch Copy Type-A port
4 USB One Touch Copy LED 8 USB One Touch Copy button
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Product Overview 7
Left Panel
No. Component No. Component
1 PCIe 2.0 x4 slot 3 Memory slot 1
2 Memory slot 2 - -
Rear Panel
No. Component No. Component
1 Ethernet Port (RJ45) 6 USB 3.0 Type-A port
2 Gigabit Ethernet LEDs 7 HDMI 2.0 port
3 Kensington security slot 8 Reset button
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Product Overview 8
No. Component No. Component
4 Power input 9 PCIe low-profile cover
5 USB 2.0 Type-A ports - -
Drive Numbering
Installation Requirements
Category Item
Environment • Room temperature: 0˚C to 40˚C (32˚F to 104˚F)
• Non-condensing relative humidity: 5% to 95%
• Wet-bulb temperature: 27˚C (80.6˚F)
• Flat, anti-static surface without exposure to direct sunlight, liquids,
or chemicals
• Free from objects that may obstruct NAS ventilation or apply
pressure to the NAS or power cord
Hardware and peripherals • Storage drives
For the list of compatible drive models, go to https://
www.qnap.com/compatibility.
• Network cable
Tools • Phillips #1 or #2 screwdriver
• Flat head screwdriver
• Anti-static wrist strap
Setting Up the NAS
TS-251D User Guide
Product Overview 9
1. Place your NAS device in an environment that meets the requirements.
For details, see Installation Requirements
2. Install the drives.
For details, see the following topics:
•Installing 3.5-inch Hard Drives on 3.5-inch Trays
•Installing 2.5-inch Hard Drives or Solid-State Drives on 3.5-inch Trays
3. Connect the power cord and all applicable cables.
4. Power on the NAS.
5. Install QTS.
For details, see QTS Installation.
6. Log on to QTS.
TS-251D User Guide
Product Overview 10
3. Installation and Configuration
This chapter provides specific hardware and firmware installation and configuration steps.
Hardware Installation
This section provides information on installing drives, memory modules, and expansion cards.
Drive Installation
The TS-251D is compatible with 3.5-inch hard drives, 2.5-inch hard drives, and 2.5-inch solid-state drives.
Installing 3.5-inch Hard Drives on 3.5-inch Trays
Warning
• Installing a drive deletes all data on the drive.
• Observe electrostatic discharge (ESD) procedures to avoid damage to components.
1. Power off the NAS.
2. Remove the front cover.
a. Locate the locking mechanism on the left side of the NAS.
b. Slide the lock down to release the front cover.
c. Slide the front cover to the left and then pull.
d. Remove the cover.
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Installation and Configuration 11
3. Remove a drive tray by simultaneously pressing the latch and pulling the tray.
4. Install a drive on the tray.
a. Remove the fastening panels from the sides of the drive tray.
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Installation and Configuration 12
b. Attach the fastening panels to lock the drive to the tray.
c. Attach the screws.
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Installation and Configuration 13
5. Slide the tray into the drive bay.
6. Attach the front cover.
a. Align the front cover with the grooves on the case and then slide to the right.
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Installation and Configuration 14
b. Slide the lock up to secure the front cover.
7. Power on the NAS.
Installing 2.5-inch Hard Drives or Solid-State Drives on 3.5-inch Trays
Warning
• Installing a drive deletes all data on the drive.
• Observe electrostatic discharge (ESD) procedures to avoid damage to components.
1. Power off the NAS.
2. Remove the front cover.
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Installation and Configuration 15
a. Locate the locking mechanism on the left side of the NAS.
b. Slide the lock down to release the front cover.
c. Slide the front cover to the left and then pull.
d. Remove the cover.
3. Remove a drive tray by simultaneously pressing the latch and pulling the tray.
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Installation and Configuration 16
4. Install a drive on the tray.
a. Remove the right fastening panel from the drive tray.
b. Place the drive on the tray so that the holes on the bottom of the drive are aligned with the holes
on the bottom of the tray.
c. Attach the screws to lock the drive to the tray.
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Installation and Configuration 17
5. Slide the tray into the drive bay.
6. Attach the front cover.
a. Align the front cover with the grooves on the case and then slide to the right.
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Installation and Configuration 18
b. Slide the lock up to secure the front cover.
Installing Expansion Cards
The TS-251D supports selected expansion cards, some of which require QNAP PCIe brackets. QNAP
branded expansion cards purchased from the company website are shipped with the brackets necessary to
fit all QNAP NAS models. The TS-251D series uses low-profile flat brackets.
Warning
• Only qualified personnel should perform the following steps. Failure to follow
instructions can result in serious injury or death.
• Observe electrostatic discharge (ESD) procedures to avoid damage to components.
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Installation and Configuration 19
1. Power off the NAS.
2. Disconnect the power cord from the electrical outlet.
3. Disconnect all cables and external attachments.
4. Remove the front cover.
a. Locate the locking mechanism on the left side of the NAS.
b. Slide the lock down to unlock the front cover.
c. Slide the front cover to the left and then pull.
5. Remove the case cover.
a. Remove the screws that secure the case cover to the chassis.
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Installation and Configuration 20
b. Slide the cover back to detach it from the chassis.
c. Pull the cover to the left to remove it.
6. Position the NAS on its right side.
7. Remove the PCIe slot cover.
a. Remove the screw.
b. Remove the cover from the slot.
8. Optional: Attach the QNAP low-profile flat bracket to the expansion card.
a. Remove all screws of the existing bracket.
b. Carefully pull the bracket away from the card.
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Installation and Configuration 21
c. Attach the QNAP bracket to the card using the same screws.
d. Verify that the bracket does not move.
9. Install the expansion card.
a. Hold the expansion card by the edges.
b. Insert the card into the slot.
c. Attach the screw.
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Installation and Configuration 22
10. Place the NAS in its normal upright position.
11. Attach the case cover.
a. Push the cover to the right to attach it to the chassis.
b. Slide the cover forward to secure it.
c. Attach the screws to the back of the NAS.
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Installation and Configuration 23
12. Attach the front cover.
a. Align the cover with the grooves on the case.
b. Slide the cover to the right.
c. Slide the lock up.
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Installation and Configuration 24
13. Connect all cables and external attachments.
14. Power on the NAS.
Replacing Memory Modules
The TS-251D has two memory slots. You can increase the memory capacity of the NAS by upgrading the
memory modules. When using two modules, use only QNAP modules of the same type and capacity to
maintain system performance and stability. You can purchase QNAP memory modules from authorized
resellers.
Warning
• Only qualified personnel should perform the following steps. Failure to follow
instructions can result in serious injury or death.
• Observe electrostatic discharge (ESD) procedures to avoid damage to components.
1. Power off the NAS.
2. Disconnect the power cord from the electrical outlet.
3. Disconnect all cables and external attachments.
4. Remove the front cover.
a. Locate the locking mechanism on the left side of the NAS.
b. Slide the lock down to unlock the front cover.
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Installation and Configuration 25
c. Slide the front cover to the left and then pull.
5. Remove each drive tray by simultaneously pressing the latch and pulling the tray.
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Installation and Configuration 26
6. Position the NAS on its right side.
7. Optional: Remove an existing module.
a. Push the retention clips outward simultaneously to release the module.
b. Verify that the module has tilted upward and is completely released from the slot.
Warning
Attempting to remove a module that is not completely released may damage the module and
the motherboard.
8. Hold the module by the edges and then carefully slide it out of the slot.
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Installation and Configuration 27
9. Install a new module.
a. Align the notch with the ridge in the slot.
b. Insert the module into the slot.
c. Verify that the metal connectors are completely inserted into the slot.
d. Carefully press down on the module until the retention clips lock the module into place.
10. Place the NAS in its normal upright position.
11. Load drive trays back into the NAS.
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Installation and Configuration 28
12. Attach the front cover.
a. Align the cover with the grooves on the case.
b. Slide the cover to the right.
c. Slide the lock up.
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Installation and Configuration 29
13. Connect all cables and external attachments.
14. Power on the NAS.
QTS Installation
Method Description Requirements
Qfinder Pro
installation
(Recommended)
If the NAS is connected to your local area
network, you can do the following:
• Locate the NAS using Qfinder Pro.
• Complete the steps in the Smart
Installation Guide wizard.
• Computer
• Network cable
• Qfinder Pro installer
Cloud installation If the NAS is connected to the internet,
you can do the following:
• Scan the QR code on the NAS.
• Specify the Cloud Key.
• Log into your myQNAPcloud account.
• Use myQNAPcloud Link to remotely
access your NAS.
• Complete the steps in the Smart
Installation Guide wizard.
• Computer or mobile device
• myQNAPcloud account
• CloudKey
TS-251D User Guide
Installation and Configuration 30
Method Description Requirements
Local installation If the NAS supports HDMI output, you can
do the following:
• Connect the NAS to the required
hardware.
• Complete the steps in the Smart
Installation Guide wizard.
• Monitor
• HDMI cable
• USB keyboard or Remote control (not
available on all models)
Installing QTS Using Qfinder Pro
Warning
Installing QTS deletes all data on the drives. Back up your data before proceeding.
1. Power on the NAS.
2. Connect the NAS to your local area network.
3. Run Qfinder Pro on a computer that is connected to the same local area network.
Note
To download Qfinder Pro, go to https://www.qnap.com/utilities.
4. Locate the NAS in the list and then double-click the name or IP address.
The Smart Installation Guide opens in the default web browser.
5. Click Start Smart Installation Guide.
6. Specify the following information.
•NAS name: Specify a name with 1 to 14 characters. The name supports letters (A to Z, a to z),
numbers (0 to 9), and hyphens (-), but cannot end with a hyphen.
•Password: Specify an administrator password with 1 to 64 characters. The password supports all
ASCII characters.
7. Click Next.
8. Specify the time zone, date, and time.
Tip
QNAP recommends connecting to an NTP server to ensure that the NAS follows the
Coordinated Universal Time (UTC) standard.
9. Click Next.
10. Select Obtain an IP address automatically (DHCP).
11. Click Next.
12. Select the types of devices that you will use to access shared folders on the NAS.
13. Click Next.
14. Review the settings.
15. Click Apply.
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Installation and Configuration 31
A confirmation message appears.
Warning
Clicking Confirm deletes all data on the drive before installing QTS.
16. Click Confirm.
QTS is installed.
Installing QTS Using the Cloud Key
Warning
Installing QTS deletes all data on the drives. Back up your data before proceeding.
1. Power on the NAS.
2. Connect the NAS to the internet.
3. Go to the QNAP Cloud Installation page using one of the following methods:
• On your computer, go to http://install.qnap.com/.
• Scan the QR code on the NAS using a mobile device.
The web page lists all the uninitialized QNAP NAS devices on the local network.
4. Find your NAS from the list and then click Initialize.
Note
If your NAS is not listed, follow the instructions on the web page to specify the Cloud Key on the
NAS.
The installation wizard opens in the default web browser.
5. Create an account or sign in to myQNAPcloud.
Note
You must return to this page to complete the installation after creating an account.
6. Specify the myQNAPcloud device name for the NAS.
Note
• The myQNAPcloud device name is used when remotely accessing the NAS.
• For security purposes, the myQNAPcloud Link remote connection service will be disabled
on your NAS after initialization. You can enable it by connecting to QTS through LAN and
then installing myQNAPcloud Link.
7. Click Next.
The Smart Installation Guide opens in the default web browser.
8. Click Start Smart Installation Guide.
9. Specify the following information.
•NAS name: Specify a name with 1 to 14 characters. The name supports letters (A to Z, a to z),
numbers (0 to 9), and hyphens (-), but cannot end with a hyphen.
TS-251D User Guide
Installation and Configuration 32
•Password: Specify an administrator password with 1 to 64 characters. The password supports all
ASCII characters.
10. Click Next.
11. Specify the time zone, date, and time.
Tip
QNAP recommends connecting to an NTP server to ensure that the NAS follows the
Coordinated Universal Time (UTC) standard.
12. Click Next.
13. Select Obtain an IP address automatically (DHCP).
14. Click Next.
15. Select the types of devices that you will use to access shared folders on the NAS.
16. Click Next.
17. Review the settings.
18. Click Apply.
A confirmation message appears.
Warning
Clicking Confirm deletes all data on the drive before installing QTS.
19. Click Confirm.
QTS is installed.
Installing QTS Using an HDMI Connection
Warning
Installing QTS deletes all data on the drives. Back up your data before proceeding.
1. Connect an HDMI display to the NAS.
2. Connect a USB keyboard to the NAS or prepare the QNAP IR remote control (not available on all
models).
3. Power on the NAS.
The Welcome screen of the Smart Installation Guide appears.
4. Select Start Smart Installation Guide.
5. Select No, skip this process.
Enabling the multimedia functions allows you to install multimedia applications after configuring the
disks in Storage & Snapshots.
For details on enabling multimedia functions on QTS, see the System Administration section of the
QTS User Guide.
6. Select Configure later.
For details on configuring disks, see the Storage & Snapshots section of the QTS User Guide.
7. Review the settings.
8. Click Next.
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Installation and Configuration 33
9. Review the settings.
10. Click Next.
The Confirm screen appears.
Warning
Clicking Next deletes all data on the drive before installing QTS.
11. Click Next.
QTS is installed.
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Installation and Configuration 34
4. Basic Operations
This chapter describes basic NAS operations.
Power Button
Operation User Action Result
Power on Press the button once. The NAS powers on.
Power off Press and hold the button for 1.5
seconds.
The NAS powers off.
Force power off Press and hold the button for 5
seconds.
The NAS shuts down.
Important
Use this method only
when the NAS is
unresponsive.
Reset Button
Operation User Action Result
Basic system reset Press and hold the
button for 3 seconds.
The following settings are reset to default:
• System administrator password: admin
• TCP/IP configuration:
• Obtain IP address settings automatically via
DHCP
• Disable jumbo frames
• If port trunking is enabled (multi-LAN models
only), the port trunking mode is reset to “Active
Backup (Failover)”.
• System port: 8080 (system service port)
• Security level: Low (Allow all connections)
• LCD panel password: (blank)
• VLAN: Disabled
Advanced system
reset
Press and hold the
button for 15 seconds.
The default factory settings are restored.
• To retrieve old data after an advanced system reset,
recreate the previous folder structure on the NAS.
USB One Touch Copy Button
The USB One Touch Copy button allows you to copy data backups from a USB device to the NAS or from
the NAS to a USB device.
This feature supports incremental backups. The NAS only copies files that were modified or added after the
last backup.
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Basic Operations 35
LEDs
LEDs indicate system status and related information when the NAS is powered on. The following LED
information applies only when the drive is correctly installed and when the NAS is connected to the network.
For details on the location of the LEDs, see Front Panel.
LED Status Description
System Status Flashes green and red
alternately every 0.5
seconds
• The drive is being formatted.
• The NAS is being initialized.
• The operating system is being updated.
• RAID rebuilding is in progress.
• Online RAID Capacity Expansion is in progress.
• Online RAID Level Migration is in progress.
Red • The drive is invalid.
• The disk volume has reached its full capacity.
• The disk volume is about to reach its full capacity.
• The system fan is not functioning.
• An error occured when accessing (read/write) the data.
• A bad sector is detected on the hard drive.
• One drive failed under any RAID condition other than
RAID 1.
• Both drives failed.
• A hardware self-test error occurred.
Flashes red every 0.5
seconds
The NAS is in degraded mode (one member drive failed in
RAID 1).
Flashes green every 0.5
seconds
• The NAS is starting up.
• The NAS is not configured.
• A drive is not formatted.
Green The NAS is ready.
Off All drives are in standby mode.
LAN Orange A read/write error occured while another device is
accessing data.
Flashes orange The NAS is being accessed from the network.
Drive Flashes red The data is being accessed and a read/write error occurs
during the process.
Red A drive read/write error occured.
Flashes green The data is being accessed.
Green The drive can be accessed.
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Basic Operations 36
LED Status Description
USB Flashes blue every 0.5 sec • A USB device (connected to the front USB port) is
detected.
• A USB device (connected to the front USB port) is
being removed from the NAS.
• A USB device (connected to the front USB port of the
NAS) is being accessed.
• Data is being copied to or from a USB or eSATA
device.
Blue A USB device is detected in the front USB port.
Off • No USB device is detected.
• The NAS has finished copying data to or from the USB
device connected to the front USB port.
Audio Alert
Duration Frequency Description
Short beep (0.5 seconds) 1 • The NAS is starting up.
• The NAS is shutting down (software shutdown).
• The user pressed the Reset button.
• The operating system was updated.
3 The user tried to copy the NAS data to the external
storage device from the front USB port, but the data
cannot be copied.
Long beep (1.5 seconds) 3 (every 5 minutes) The system fan is not functioning.
2 • The disk volume is about to reach its full
capacity.
• The disk volume has reached its full capacity.
• The drives are in degraded mode.
• The user started the drive rebuilding process.
• A drive is plugged in or out.
1 • The NAS was powered off by force shutdown
(hardware shutdown).
• The NAS was powered on successfully and is
ready.
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Basic Operations 37
5. Troubleshooting
This chapter describes basic troubleshooting information.
Forcing Qfinder Pro or myQNAPcloud to Locate the NAS
If Qfinder Pro or myQNAPcloud is unable to locate the NAS during QTS installation, the drives or data may
be faulty.
1. Power off the NAS.
2. Remove all drives.
3. Power on the NAS.
4. Locate the NAS using Qfinder Pro or myQNAPcloud.
5. Reinsert the drives.
6. Continue with the QTS installation.
Hot-Swapping Failed Drives
The NAS supports hot-swapping drives when one member drive fails in RAID 1.
1. Log on to QTS.
2. Go to Main Menu > Storage Manager > Storage > Disks/VJBOD .
3. Locate the failed drive.
4. Prepare a new hard drive with a capacity that is the same as or larger than the failed hard drive.
5. Remove the failed drive from the NAS.
6. Wait for 20 seconds or until the NAS beeps twice.
7. Remove the failed drive from the drive tray.
8. Insert the new drive into the drive tray.
9. Install the new drive.
The NAS beeps twice.
10. Go to Main Menu > Storage Manager > Storage Space .
11. Locate the volume that contains the new drive and then verify that the status is Rebuilding.
Recovering Unintentionally Removed Healthy Drives
The NAS supports exclusive RAID recovery technology to recover failed RAID disk volumes from
unintentional disconnection or removal of drives. Users can recover an inactive RAID 1 volume to degraded
mode, or an inactive RAID 0 and JBOD configuration to normal.
Disk Volume RAID Recovery Support Maximum Number of Removed Drives
Single No N/A
JBOD Yes 1
TS-251D User Guide
Troubleshooting 38
Disk Volume RAID Recovery Support Maximum Number of Removed Drives
RAID 0 Yes 1
RAID 1 Yes 1
Support and Other Resources
Resource URL
Documentation https://docs.qnap.com
Service Portal https://service.qnap.com
Downloads https://download.qnap.com
Community Forum https://forum.qnap.com
TS-251D User Guide
Troubleshooting 39
6. Glosssary
CloudKey
Unique 8-digit code assigned to each NAS device
myQNAPcloud Link
Enables you to access the NAS over the internet without configuring complex port forwarding settings
myQNAPcloud
Provides various remote access services such as DDNS and myQNAPcloud Link
myQNAPcloud ID
Email address that was used to register for a myQNAPcloud account
Qfinder Pro
QNAP utility that lets you locate and access QNAP NAS devices in your local area network
QTS
QNAP NAS operating system
TS-251D User Guide
Glosssary 40
7. Notices
This chapter provides information about warranty, disclaimers, licensing, and federal regulations.
Limited Warranty
QNAP offers limited warranty service on our products. Your QNAP-branded hardware product is warranted
against defects in materials and workmanship for a period of one (1) year or more from the date printed on
the invoice. ("Warranty Period"). Please review your statutory rights at www.qnap.com/warranty, which may
be amended from time to time by QNAP in its discretion.
Disclaimer
Information in this document is provided in connection with products of QNAP Systems, Inc. (the "QNAP").
No license, express or implied, by estoppels or otherwise, to any intellectual property rights is granted by this
document. Except as provided in QNAP's terms and conditions of sale for such products, QNAP assumes no
liability whatsoever, and QNAP disclaims any express or implied warranty, relating to sale and/or use of
QNAP products including liability or warranties relating to fitness for a particular purpose, merchantability, or
infringement of any patent, copyright or other intellectual property right.
QNAP products are not intended for use in medical, life saving, life sustaining, critical control or safety
systems, or in nuclear facility applications.
In no event shall QNAP’s liability exceed the price paid for the product from direct, indirect, special,
incidental, or consequential damages resulting from the use of the product, its accompanying software, or its
documentation. QNAP makes no warranty or representation, expressed, implied, or statutory, with respect to
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disclaims its quality, performance, merchantability, or fitness for any particular purpose. QNAP reserves the
right to revise or update its products, software, or documentation without obligation to notify any individual or
entity.
Back up the system periodically to avoid any potential data loss is recommended. QNAP disclaims any
responsibility of all sorts of data loss or recovery.
Should you return any components of the package of QNAP products such as NAS (Network Attached
Storage) for refund or maintenance, make sure they are carefully packed for shipping. Any form of damages
due to improper packaging will not be compensated.
All the features, functionality, and other product specifications are subject to change without prior notice or
obligation. Information contained herein is subject to change without notice.
Further, the ® or ™ symbols are not used in the text.
GNU Public License
Version 3, 29 June 2007
Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not
allowed.
Preamble
The GNU General Public License is a free, copy left license for software and other kinds of works.
The licenses for most software and other practical works are designed to take away your freedom to share
and change the works. By contrast, the GNU General Public License is intended to guarantee your freedom
to share and change all versions of a program--to make sure it remains free software for all its users. We, the
TS-251D User Guide
Notices 41
Free Software Foundation, use the GNU General Public License for most of our software; it applies also to
any other work released this way by its authors. You can apply it to your programs, too.
When we speak of free software, we are referring to freedom, not price. Our General Public Licenses are
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pieces of it in new free programs, and that you know you can do these things.
To protect your rights, we need to prevent others from denying you these rights or asking you to surrender
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it: responsibilities to respect the freedom of others.
For example, if you distribute copies of such a program, whether gratis or for a fee, you must pass on to the
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source code. And you must show them these terms so they know their rights.
Developers that use the GNU GPL protect your rights with two steps: (1) assert copyright on the software,
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For the developers' and authors' protection, the GPL clearly explains that there is no warranty for this free
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Some devices are designed to deny users access to install or run modified versions of the software inside
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Finally, every program is threatened constantly by software patents. States should not allow patents to
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prevent this, the GPL assures that patents cannot be used to render the program non-free.
The precise terms and conditions for copying, distribution and modification follow.
Terms and Conditions
1. Definitions.
“This License” refers to version 3 of the GNU General Public License.
“Copyright” also means copyright-like laws that apply to other kinds of works, such as semiconductor
masks.
“The Program” refers to any copyrightable work licensed under this License. Each licensee is
addressed as “you”. “Licensees” and “recipients” may be individuals or organizations.
To “modify” a work means to copy from or adapt all or part of the work in a fashion requiring copyright
permission, other than the making of an exact copy. The resulting work is called a “modified version” of
the earlier work or a work “based on” the earlier work.
A “covered work” means either the unmodified Program or a work based on the Program.
To “propagate” a work means to do anything with it that, without permission, would make you directly or
secondarily liable for infringement under applicable copyright law, except executing it on a computer or
modifying a private copy. Propagation includes copying, distribution (with or without modification),
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To “convey” a work means any kind of propagation that enables other parties to make or receive
copies. Mere interaction with a user through a computer network, with no transfer of a copy, is not
conveying.
An interactive user interface displays “Appropriate Legal Notices” to the extent that it includes a
convenient and prominently visible feature that (1) displays an appropriate copyright notice, and (2)
TS-251D User Guide
Notices 42
tells the user that there is no warranty for the work (except to the extent that warranties are provided),
that licensees may convey the work under this License, and how to view a copy of this License. If the
interface presents a list of user commands or options, such as a menu, a prominent item in the list
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2. Source Code.
The “source code” for a work means the preferred form of the work for making modifications to it.
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5. Conveying Verbatim Copies.
TS-251D User Guide
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You may convey verbatim copies of the Program's source code as you receive it, in any medium,
provided that you conspicuously and appropriately publish on each copy an appropriate copyright
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You may charge any price or no price for each copy that you convey, and you may offer support or
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6. Conveying Modified Source Versions.
You may convey a work based on the Program, or the modifications to produce it from the Program, in
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c. You must license the entire work, as a whole, under this License to anyone who comes into
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This License gives no permission to license the work in any other way, but it does not invalidate
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TS-251D User Guide
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the object code. If the place to copy the object code is a network server, the Corresponding
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a. Disclaiming warranty or limiting liability differently from the terms of sections 15 and 16 of this
License; or
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Each time you convey a covered work, the recipient automatically receives a license from the original
licensors, to run, modify and propagate that work, subject to this License. You are not responsible for
enforcing compliance by third parties with this License.
TS-251D User Guide
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An “entity transaction” is a transaction transferring control of an organization, or substantially all assets
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Nothing in this License shall be construed as excluding or limiting any implied license or other defenses
to infringement that may otherwise be available to you under applicable patent law.
13. No Surrender of Others' Freedom.
TS-251D User Guide
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If conditions are imposed on you (whether by court order, agreement or otherwise) that contradict the
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14. Use with the GNU Affero General Public License.
Notwithstanding any other provision of this License, you have permission to link or combine any
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License, section 13, concerning interaction through a network will apply to the combination as such.
15. Revised Versions of this License.
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LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR
OTHER PARTIES PROVIDE THE PROGRAM “AS IS” WITHOUT WARRANTY OF ANY KIND, EITHER
EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM
PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR
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IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL ANY
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PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE
OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR
DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES
OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF
SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
DAMAGES.
18. Interpretation of Sections 16 and 17.
If the disclaimer of warranty and limitation of liability provided above cannot be given local legal effect
according to their terms, reviewing courts shall apply local law that most closely approximates an
absolute waiver of all civil liability in connection with the Program, unless a warranty or assumption of
liability accompanies a copy of the Program in return for a fee.
TS-251D User Guide
Notices 48
END OF TERMS AND CONDITIONS
CE Notice
This QNAP NAS complies with CE Compliance Class B.
FCC Notice
FCC Class B Notice
This device complies with Part 15 of the FCC Rules. Operation is subject to the
following two conditions:
1. This device may not cause harmful interference.
2. This device must accept any interference received, including interference that may cause undesired
operation.
Note
This equipment has been tested and found to comply with the limits for a Class B digital
device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference in a residential installation. This
equipment generates, uses, and can radiate radio frequency energy and, if not installed
and used in accordance with the instructions, may cause harmful interference to radio
communications. However, there is no guarantee that interference will not occur in a
particular installation. If this equipment does cause harmful interference to radio or
television reception, which can be determined by turning the equipment off and on, the
user is encouraged to try to correct the interference by one or more of the following
measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the
receiver is connected.
• Consult the dealer or an experienced radio/television technician for help.
Important
Any modifications made to this device that are not approved by QNAP Systems, Inc. may
void the authority granted to the user by the FCC to operate this equipment.
TS-251D User Guide
Notices 49
VCCI Notice
VCCI–B
BSMI Notice
SJ/T 11364-2006
本产品符合中国 RoHS 标准。以下表格标示此产品中某有毒物质的含量符合中国
RoHS 标准规定的限量要求。
本产品上会附有”环境友好使用期限”的标签，此期限是估算这些物质”不会有泄漏或突变”的年限。本产品
可能包含有较短的环境友好使用期限的可替换元件，像是电池或灯管，这些元件将会单独标示出来。
部件名称 有毒有害物质或元素
铅
(Pb)
汞
(Hg)
镉
(Cd)
六价铬
(CR(VI))
多溴联苯
(PBB)
多溴二苯醚
(PBDE)
壳体 0 0 0 0 0 0
显示 0 0 0 0 0 0
印刷电路板 0 0 0 0 0 0
金属螺帽 0 0 0 0 0 0
电缆组装 0 0 0 0 0 0
风扇组装 0 0 0 0 0 0
电力供应组装 0 0 0 0 0 0
电池 0 0 0 0 0 0
O: 表示该有毒有害物质在该部件所有物质材料中的含量均在 SJ/T11363-2006 标准规定的限量要求以下。
TS-251D User Guide
Notices 50
部件名称 有毒有害物质或元素
铅
(Pb)
汞
(Hg)
镉
(Cd)
六价铬
(CR(VI))
多溴联苯
(PBB)
多溴二苯醚
(PBDE)
X: 表示该有毒有害物质至少在该部件的某一均质材料中的含量超出 SJ/T11363-2006 标准规定的限量要求。
TS-251D User Guide
Notices 51