QNAP TVS-472XT 4-Bay NAS Enclosure - Manual (Page 118)

4. Click Next.
5. Create the ultra-high speed tier.
a. Click
.
b. Optional: Select an expansion unit.
Important
If you create the ultra-high speed tier using disks installed in a TL-series expansion unit, then
the two tiers (high speed, capacity) must consist of disks from the same expansion unit.
c. Select one or more solid-state drives (SSDs).
d. Select a RAID type.
For details, see RAID Types .
e. Optional: Select the disk that will be used as a hot spare for the ultra-high speed tier.
6. Optional: Create the high speed tier.
At least two different tiers are required in a Qtier storage pool.
a. Click
.
b. Optional: Select an expansion unit.
c. Select one or more SAS hard disk drives (HDDs).
d. Select a RAID type.
For details, see RAID Types .
e. Optional: Select the disk that will be used as a hot spare for the high speed tier.
7. Optional: Create the capacity tier.
At least two different tiers are required in a Qtier storage pool.
a. Click
.
b. Optional: Select an expansion unit.
c. Select one or more SATA or NL-SAS HDDs.
d. Select a RAID type.
For details, see RAID Types .
e. Optional: Select the disk that will be used as a hot spare for the capacity tier.
8. Click Next.
9. 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.
10. Optional: Configure the alert threshold.
QTS 4.4.x User Guide
Storage & Snapshots 117