QNAP Systems Ts 253 User Guide

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test), schedule weekly sequential read tests, and check the test results to 
gauge the performance of the tested disks.    
 
HDD S.M.A.R.T Information 
Switch to the icon view (or tree view) and click the Disk Health button to bring up the Disk Health 
window. 
  
First select the NAS Host or an expansion enclosure and one of its disks to check for S.M.A.R.T 
information. Refer to the below table for descriptions of each field: 
Field Description 
Summary This page provides an overview on hard...

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TLER/ERC timer (seconds): This option allows system administrators to configure the hard disk 
drive R/W response time. If you are not sure about the interval to set for the timer, please leave 
it as is.    
 
Expansion Enclosures 
 
Expansion enclosures are designed for expanding the storage capacity of a QNAP NAS. This is 
achieved either through a direct, physical connection between a NAS and expansion enclosures (via 
USB or mini-SAS cables) or a network connection between two NAS (using a...

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1. Recover Enclosure: Recover volumes on an enclosure that was accidentally disconnected (e.g. 
unscheduled shutdown or unplugged SAS cable) from the NAS host. When this occurs, a broken 
chain symbol will be shown in the Chassis View and the status of the affected storage pool will be 
shown as Error and RAID group as Not active. 
2. Reinitialize enclosure ID: This is only used to reorder ID for expansion enclosures in a numerical 
manner. 
3. Scan All Free Drives: Scan drives in a free state in...

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Note:  
This function or its content is only applicable to some models (refer to the software 
specification page on the QNAP website for further details) and requires firmware 4.2.2 
(or newer). 
Any QNAP NAS that supports iSCSI and storage pools can be used as a remote NAS, 
but it is recommended that they use firmware 4.2.1 (or newer) and have at least 
154GB free space. 
For greater connection stability and to automatically recover from connection failure, it 
is recommended that both...

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o Specify the system port and enable Secure Connection (HTTP) for a secure connection to the 
remote NAS. 
o Use Test to test the connection settings.  
o Click Next. 
5. Select Create a new iSCSI LUN on the selected NAS.  
o You can click NAS Detail in the top-right corner to check the storage status of the selected 
NAS. 
o Tick Host Binding if the LUN will be used to store sensitive information.  
o Click Next. 
6. Select a storage pool and click Next. 
7. Choose to set up CHAP authentication...

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3. The Create Virtual JBOD’s Disk Wizard will appear. Read the introduction and click "Next". 
4. Establish a connection to a remote NAS:  
o Enter the remote NAS’ IP address (or click "Detect" and select the NAS using its hostname or 
IP from the dropdown list). Or click Local Host to mount a LUN from the local host itself. 
o Enter the username and password used to log into the remote NAS (or the credentials of the 
local host if you select it in the last step). 
o Specify the...

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configuration, shared folders and installed applications. 
Remote Log (under Action) Review logs (including information, warnings and errors) of 
the storage pool or NAS where the VJBOD disk is located. This 
will allow you to identify issues on the remote pool if the 
VJBOD becomes abnormal. You can click on the down arrow 
button on the Log page for advanced log search 
functionality. 
Date Recovery (under Action) Recover the Volume or Storage Pool in VJBODs (if it exists). 
This action is only...

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Tip:  
If the firmware of the remote NAS is 4.2.2 (or newer), you can monitor what NAS has 
connected to an iSCSI LUN, as well as receive warnings if the iSCSI connection is lost 
on the iSCSI Storage page (Storage Manager > iSCSI > iSCSI Storage).  
If more detailed monitoring is required for multiple NAS, you can use Qcenter to 
monitor both host and remote NAS.  
 
Detaching and Reconnecting VJBODs  
If a VJBOD has been used to create a virtual volume or storage pool, that volume or...

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4. Click OK and the VJBOD will enter the Ready status.  
 
You can detach all of the VJBOD disks at once. To do so, go to the Virtual JBOD Overview page 
(click the Virtual JBOD Overview button in the top-right corner of the Storage Manager window) 
and click Safely Detach all. Detached VJBODs can be re-attached by selecting Recover > Scan All 
Free Disks in the Disks/VJBOD page. 
 
Note: To protect the data and file system of VJBODs, always detach them before shutting 
down the remote NAS....

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Storage Space 
 
The Storage Space features Storage Pools and Volumes. This page lists available storage pools and 
the volumes, iSCSI LUNs, and snapshots from remote NAS on each of these storage pools. It displays 
these storage entities’ capacity and/or usage to give a complete view of storage allocation. Users can 
create or manage storage pools/volumes/RAID groups, or take/view snapshots of the volumes on this 
page.  
 
 
Below is a chart of what the icons and bars indicate. 
Symbol...