User Guide

Storage Settings
Setting Description
RAID Resync Priority Specify the priority level for the following RAID operations when the NAS is
in use:
• Rebuild
• Scrubbing
• Sync
You can select one of the following priorities.
• Service: When selected, QTS performs RAID operations at lower
speeds to maintain NAS performance.
• Default: When selected, QTS performs RAID operations at medium
speeds.
• Resync First: When selected, QTS performs RAID operations at higher
speeds. Users may notice a decrease in NAS performance.
Important
When the NAS is idle, all RAID operations are performed
at the highest possible speeds.
RAID Scrubbing Schedule Enable this feature to periodically scan for and automatically fix bad sectors
on RAID 5 and RAID 6 groups. For details, see Running RAID Scrubbing on
a Schedule.
Auto Reclaim and SSD Trim
Schedule
Enable this feature to periodically run the following tasks on all thin volumes
and SSDs:
• Auto Reclaim: QTS returns unused storage space to the parent storage
pool. The unused storage space is derived from files deleted from thin
volumes.
• SSD Trim: QTS cleans deleted data blocks to maintain SSD read and
write performance.
By default, the operations are scheduled to run daily at 2:00 AM. SSD Trim
is only performed on solid state drives if they are in a RAID 0, RAID 1 or
RAID 10 group.
Disk Health Settings
Setting Description
Activate Predictive
S.M.A.R.T. Migration:
Enable this feature to regularly monitor disk health. If S.M.A.R.T. errors are
detected on a disk, QTS displays a warning and then begins migrating data
from the faulty disk to a healthy spare disk. After migration is completed, the
healthy disk is used in place of the faulty disk.
This process is faster and safer than waiting for a disk to fail, and then
initiating a full RAID rebuild.
Disk S.M.A.R.T. polling time
(minutes)
QTS will check periodically for S.M.A.R.T. errors. You can specify the
frequency in minutes or hours.
QTS 4.3.4 Getting Started Guide
Storage & Snapshots 51