QNAP TVS-472XT 4-Bay NAS Enclosure - Manual (Page 61)

• If the expansion unit is disconnected from the NAS, the storage pool becomes inaccessible
until it is reconnected.
8. Select one or more disks.
Warning
All data on the selected disks will be deleted.
9. Select a RAID type.
QTS displays all available RAID types and automatically selects the most optimized RAID type.
Important
• If the storage pool contains a RAID 1, RAID 5, RAID 6 or RAID 10 group, the new RAID group
must also have one of the mentioned RAID types.
• For RAID 50 or RAID 60, you cannot select a different RAID type.
10. Optional: Select the disk that will be used as a hot spare for this RAID group.
The designated hot spare automatically replaces any disk in the RAID group that fails.
11. Click Next.
12. Optional: Configure SSD over-provisioning.
Over-provisioning reserves a percentage of SSD storage space on each disk in the RAID group to
improve write performance and extend the disk's lifespan. You can decrease the amount of space
reserved for over-provisioning after QTS has created the RAID group.
Tip
To determine the optimal amount of over-provisioning for your SSDs, download and run SSD
Profiling Tool from App Center.
13. Click Next.
14. Click Expand.
A confirmation message appears.
15. Click OK.
QTS creates the new RAID group and then starts rebuilding the storage pool. The capacity of the pool
increases after RAID rebuilding is finished.
Storage Pool Migration
Storage pool migration enables you to safely remove a storage pool and move it to another QNAP NAS. The
following data is retained:
• Files and folders
• Storage configuration
• Snapshots
Storage Pool Migration Requirements
The following requirements apply when migrating a storage pool to a new NAS.
QTS 4.4.x User Guide
Storage & Snapshots 60