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.

Disk Temperature Alarm

Enable this feature to monitor the disk temperatures. QTS displays a warning when the disk temperature reaches the specified value. You can set separate alerts for hard disk drives and solid state drives.

TLER/ERC timer (seconds):

Enable this feature to specify how long before QTS flags a disk as unresponsive.

A disk temporarily becomes unresponsive when it encounters a read or write error, which it tries to fix. QTS might interpret this unresponsiveness as disk failure, and automatically initiate a rebuild of the disks in the RAID group. Enabling this feature ensures that a disk has sufficient time to recover from a read or write error.

Tip:

This setting is usually known as Error recovery control (ERC), Time-limited error recovery (TLER) or Command completion time limit (CCTL), depending on the manufacturer.