QNAP Systems Ts 253 User Guide

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Action Description 
Filter snapshots 
Go to Storage Manager > Snapshot > Snapshot Vault to see 
a list of available snapshots. You can filter snapshots using the 
following criteria: 
Source: Source NAS IP address 
Volume/LUN: Replicated volume or LUN 
Location: Storage pool that contains the snapshot 
Status: Snapshot status 
Note: If the status of a snapshot is not Ready, you will not be able to view or access 
that snapshot. 
 
Display content 
1.  Go Storage Manager > STORAGE >...

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Note: If the status of a snapshot is not Ready, you will not be able to view or access 
that snapshot. 
 
 
Displaying Snapshot Content 
Navigate to Snapshot Vault in Storage Manager > STORAGE > Snapshot, choose the 
desired snapshot replication from the list, and click Show Snapshots to display its content. 
You can see an overview of snapshots in the left panel or browse through folders and see files 
in the snapshots on the right panel. 
 
Click the Hide snapshot content button next to the...

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Qtier 
 
Qtier is an automated-tiering storage solutions that moves hot data to high-performance storage tiers 
and cold data to lower-cost, higher-capacity drives, allowing users to enjoy exceptional application 
performance and lower TCO of storage at the same time. This chapter covers the following topics: 
Creating Storage Space with Qtier 
Managing Auto Tiering 
Monitoring Auto-Tiering Performance 
 
Note: This function or its content is only applicable on some models. To check...

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9. The “Qtier Auto Tiering Schedule Settings” window will appear. Choose to reallocate data 
automatically during system idle time or during a specified schedule. Select “Apply”. 
 
Note:  
As relocation may affect the storage I/O performance, it is recommended to schedule 
this action during off-peak hours or when the storage is not frequently used. 
Auto Tiering cannot be started immediately after a storage pool is created, as it will 
need time to retrieve information on when data is...

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Relocation status: Indicates if auto-tiering is active (or idle). 
Enable schedule: Indicates if the schedule is enabled. 
Data reservation ratio for ultra-high speed tier: Indicates the amount of data currently set to be 
retained in the ultra-high speed tier. 
Amount of data optimized for performance: Shows the amount of data that has been allocated to 
high-speed tiers (or the Move Down or Move Up columns in Manage > Statistics) in the 
last auto tiering schedule. 
Amount of data...

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iSCSI 
 
Manage the iSCSI storage, create advanced ACLs and back up LUNs with the iSCSI management 
features. 
 
 
For details on the features, please refer to the following links: 
iSCSI Storage 
LUN Backup  

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iSCSI Storage 
 
The NAS supports a built-in Internet Small Computer System Interface (iSCSI) service for clustered 
and virtualized environments. 
 
  
An iSCSI storage network includes the following nodes: 
Target: Storage device that contains one or more LUNs, which are logical units of storage 
Initiator: Client that initiates connections (through SCSI commands) to the storage device, which is 
called a target 
 
Note: In the context of your network, your computer (an initiator) connects...

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In this chapter, these topics are covered: 
iSCSI Configuration 
Optimizing iSCSI Performance 
Advanced ACL 
Snapshot 
 
Note: 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. 
 
iSCSI Configuration 
  
The NAS supports the built-in iSCSI service. To use this function, follow the steps below: 
1. Install an iSCSI initiator on the computer (Windows PC, Mac, or Linux).        
2....

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Windows 8 or later versions) 
Microsoft ODX  Supported Not Supported 
LUN Backup Supported Supported 
LUN Snapshot Supported 1 Time Snapshot (With LUN 
Backup) 
   
Please note that in general, better system performance can be achieved through block-based LUNs, 
thus it is recommended to use block-based LUNs whenever possible. 
  
There are two methods a LUN can be allocated: Thin Provisioning and Instant Allocation:  
Thin Provisioning: Allocate the disk space in a flexible manner. The disk...

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5. Only use Enable clustering access to the iSCSI target from multiple initiators for cluster-aware 
file systems such as VMware Virtual Machine File System. The Data Digest and Header Digest 
are optional fields (expand on CRC/Checksum) and are the parameters for which the iSCSI 
initiator is verified when it attempts to connect to the iSCSI target. Click Next.  
6. Enter the CHAP authentication settings and click Next. Check Use CHAP authentication and 
only the initiator will be authenticated...