QNAP Systems Ts 253 User Guide

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Station.  
The function or its content is only applicable on some models. To check for applicable 
models, please refer to the product comparison table on the QNAP website. 
o A minimum of 4 GB RAM is required to use snapshots. 
o x51 series models only support up to 256 snapshots instead of 1024. The HS-251 
does not support snapshots. 
 
Taking a Snapshot 
After reserved space is set, you can proceed to take snapshots. To create a snapshot, follow these 
steps: 
1. Go to Storage Manager >...

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Snapshot Global Settings 
Click Global Settings in the top-right of the Snapshot Manager window, and there is one global 
setting: 
Make snapshot directory (@Recently-Snapshot) visible: Mount a snapshot volume as a directory 
of a shared folder and set the snapshot volumes to be read-only in File Station. The snapshot 
directory will appear as @Recently-Snapshot. 
 
Click Global Settings in the top-right of the Storage Manager window, and there is one global 
setting: 
When reaching snapshot...

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Otherwise, there will be no previous versions listed in File Explorer > Properties > 
Previous Versions.  
 
 
Encryption 
 
The disk volumes on the NAS can be encrypted with 256-bit AES encryption to protect against data 
breaches. Encrypted disk volumes can only be mounted for normal read/write access with an 
authorized password. The encryption feature protects confidential data from unauthorized access 
even if the hard drives or the entire NAS were stolen. 
 
Note: The AES volume-based...

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Creating new encrypted disk volumes 
1. Log into the NAS as an administrator. Go to Storage Manager > STORAGE > Storage Space 
and click Create > New Volume. 
2. Select a volume type based on your needs and click Next.  
3. Specify the volume details (including the volume capacity, alert threshold and volume alias,) tick 
Encryption, fill out the encryption password and choose whether to save the encryption key, 
select to create a shared folder automatically after new volume initialization and...

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To unlock a volume, log into the NAS as an administrator. Go to Storage Manager > STORAGE > 
Storage Space. Select a volume to be unlocked and click Manage >  Unlock this volume. Choose 
either to enter the encryption password, or use the encryption key file exported previously. Click 
Apply. If the encryption password or the key file is correct, the volume will be unlocked and become 
available. 
 
 
 
Verifying encrypted disk volumes 
To verify that a disk volume is encrypted, log into the NAS as...

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To enable Space Reclamation and SSD Trim, log into QTS, launch Storage Manager and click on the 
Global Settings icon located at the top right of the Storage Manager window. The Global Settings 
window will open, then click on Edit beside Space Reclamation and SSD Trim. There are two 
settings for Space Reclamation and SSD Trim: 
Auto reclaim and SSD trim schedule: Check this checkbox to enable space reclamation and 
SSD trim. 
Schedule: Set the schedule for thin provisioning space reclamation...

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RAID Groups 
 
Users can expand a RAID group, add hard drive(s) to a RAID group, migrate a RAID group, configure a 
spare drive, enable a bitmap and recover a RAID group for a chosen volume, while the data contained 
in the RAID group remains intact. In this chapter, the following topics are covered: 
RAID Group Introduction 
Expanding RAID Group Capacity 
Adding Hard Disk Drives 
Migrating RAID Configuration 
Configuring Spare Drives 
Enabling/Disabling Bitmap 
Recovering...

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transaction-based applications that require storage efficiency and data protection. 
A minimum of 3 hard disks are required to create a RAID 5 group. The total 
capacity of the RAID 5 group is equal to the size of the disk with the smallest 
capacity in the array times the number of (hard disk – 1). It is recommended 
(though not required) that only hard drives of the same brand and capacity are 
used to establish the most efficient hard drive capacity. 
 
In addition, if your system contains four...

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brand and capacity are used to create a RAID 10 group. RAID 10 is suitable for 
high volume transaction applications, such as a database, that require high 
performance and fault tolerance. A maximum of 1 failed disk from each disk pair is 
allowed in RAID 10. 
  
Note: To install a new disk when the server is running, first be sure the disk 
volume is in the degraded mode. Or, wait to hear two long beeps after the disk 
crashes and then insert the new disk in place of the failed disk. 
JBOD Two or...

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Adding Hard Disk Drives 
  
With this function, new drive members can be added to a RAID group. This option is supported for 
RAID 5 and RAID 6 drive configurations. 
Follow these steps to add the hard disk drive(s) to a RAID group: 
1. Go to Storage Manager > STORAGE > Storage Space.  
2. Double click a storage pool to bring up the Storage Pool Management page. 
3. Select a RAID group and click Manage > Add Hard Drive.    
4. Select hard disk drive(s) from the list to add to the chosen RAID...