QNAP TVS-472XT 4-Bay NAS Enclosure - Manual (Page 60)

11. 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.
12. Click Next.
13. Click Expand.
A confirmation message appears.
14. Click OK.
15. Optional: For a RAID 50 or RAID 60 pool, repeat these steps for each sub-group.
QTS starts rebuilding the RAID group. The storage capacity of the pool increases after RAID rebuilding is
finished.
Expanding a Storage Pool By Adding a New RAID Group
The storage capacity of a storage pool can be expanded by creating a new RAID group and then adding it to
the pool. This operation can be performed while the pool is online and accessible to users. QTS writes data
linearly to storage pools containing multiple RAID groups. This means that QTS writes data to a RAID group
until a group is full before writing data to the next RAID group.
Warning
• If a storage pool contains multiple RAID groups and one RAID group fails, all data in
the storage pool will be lost. Ensure that you have a complete data backup plan.
• To expand a RAID 50 or RAID 60 pool, you must create a new RAID 50 or 60 group with
the same number of disks and sub-groups as the original pool. It is not possible to add
additional sub-groups.
1. Go to Storage & Snapshots > Storage > Storage/Snapshots .
2. Select a storage pool.
3. Click Manage.
The Storage Pool Management window opens.
4. Select Expand Pool > Expand Pool .
The Expand Storage Pool Wizard window opens.
5. Select Create and add a new RAID group.
6. Click Next.
7. Optional: Select an expansion unit from the Enclosure Unit list.
Important
• You cannot select disks from multiple expansion units.
• You cannot use the disks from a QNAP JBOD enclosure to expand a storage pool which is
located on a different enclosure.
QTS 4.4.x User Guide
Storage & Snapshots 59