QNAP Systems Ts 253 User Guide

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Volume: Volumes are storage spaces on your NAS. A volume is formatted by the file system to 
store shared folders and files. There are three types of volumes: thick, thin and static. Thick/thin 
volumes must be created in a storage pool, and a storage pool can contain multiple thick/thin 
volumes. A thick/thin volume can be resized to a greater capacity if there is available space in the 
storage pool. Static volumes, on the other hand, are created from a RAID group instead of a 
storage pool. A...

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o High speed tier: High speed tier is a RAID group that consists of SAS disks for the data that is 
between hot data and cold data.  
o Capacity tier: Capacity tier is a RAID group that consists of SATA disks for cold data. 
Cache Acceleration: The Cache Acceleration feature is designed to boost access performance of 
the NAS by the use of SSD(s). More information on cache acceleration can be found here. 
 
Click here for more information on setting up Qtier. 
 
Disaster-recovery storage...

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Features Legacy 
Volume 
Static 
Volume 
QTS 4.1 Storage 
Pool Flexible 
Volume 
QTS 4.2 Storage 
Pool Flexible 
Volume 
Performance level High High Medium Medium 
Online RAID 
migration 
● ● ● ● 
Online RAID 
expansion 
● ● ● ● 
File-based LUN ● ● ● ● 
Block-based LUN   ● ● 
Thin provisioning   ● ● 
SSD cache  ● ● ● 
JBOD RAID 
expansion  ● ● ● 
JBOD expansion 
roaming  ● ● ● 
Snapshot    ● 
Snapshot Replica    ● 
Snapshot Vault    ● 
 
For specific setup of the Storage Manager, please refer to...

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iSCSI 
Virtual Disk 
 
Note:  
It is strongly recommended that each JBOD has its own storage pool.    Do not create storage 
pools that include hard drives outside the JBOD. Only add new disks to the JBOD (or replace the 
existing disks in the JBOD) when expanding the storage pool. Otherwise, data stored on the 
JBOD will become inaccessible when connected to a different NAS host. 
To migrate storage pools from a previous firmware version to QTS 4.2, please check the 
migration tutorial:...

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Dashboard 
 
The Storage Manager dashboard provides an overview for IT administrators to easily monitor and 
manage storage allocations.  
 
 
Overview 
 
There are three sections on the page: Disk, Volume/LUN and Storage Pool. They are described below: 
Disk: The physical hard disk drives and their associated storage hosts (including both the NAS and 
its connected expansion enclosures) are shown in this section. Click the hard disk drive icon to 
bring up the Disk Health window. For...

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Utilization 
 
This page is designed for users to monitor storage utilization of their NAS. With volume and storage 
pool usage information presented on this page, users can manage their storage system more 
effectively and spot potential issues based on trends over a period of time (from the last hour to the 
last year.) 
 
Select to view the storage usage rate of a particular volume or storage pool and specify the period. 
Click Clear Record to reset the utilization graph.      
 
Note:...

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Storage 
 
Manage volumes, storage pools, hard disk drives, snapshots, encrypt and decrypt file systems, and 
configure cache acceleration with Storage Manager.        
 
 
For details on the features, refer to the following links: 
Disks/JBOD 
Storage Space 
Cache Acceleration 
Snapshot 
Qtier (Auto Tiering) 
 
Note: Some of the features listed above are applicable to certain models. Please check for 
applicable models first as you review descriptions of the features.   

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Disks/VJBOD 
 
This page is designed for users to monitor and manage hard disk drives installed on the NAS and its 
connected expansion units (both expansion enclosures and VJBOD (also known as Virtual JBOD)). 
Users can quickly isolate and identify hard drives for relevant maintenance tasks. 
 
 
In this chapter, the following topics are covered: 
Disks  
o Managing NAS Hosts 
o Managing Disks 
o HDD S.M.A.R.T. Information 
o Disk Health Global Settings 
Expansion Enclosures 
o Managing...

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Disks 
 
Note: Hot-plugging is not supported for M.2, PCIe, and mSATA drives. 
 
Managing NAS Hosts 
Click a NAS under NAS Host in the system component panel to check its general information. Refer to 
the following table for actions available to manage a NAS host: 
Action Description 
Enclosure 
Info 
Click this button to check details of an enclosure, including the model, serial 
number, firmware version, BUS type, BIOS version, CPU temperature, system 
temperature, power status, system fan speed...

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Action Description 
Disk Info Click this button to check details of a disk, including the model, model number, 
serial number, capacity, firmware version, ATA version and ATA standard. 
Disk Health Click this button to check disk S.M.A.R.T information. More details about 
S.M.A.R.T information will be provided in the next table. 
Scan Now 
(under 
Action) 
Click this button to scan the disk for bad blocks. If bad blocks are found, the 
number of bad blocks will be displayed in the Status field....