Specifies whether RAID scrubbing should be enabled or disabled. The default value for this field is Yes, enable RAID scrubbing.
RAID scrubbing is a procedure the storage system uses to increase data availability. The storage system scans each disk in the RAID group for media errors. If errors are found, the storage system tries to fix them by reconstructing the data from parity and rewriting the data.
RAID scrubbing reduces the possibility of a failure of two disks within the same RAID group. RAID cannot recover from a disk media error if there is already a failed disk in the same RAID group.
The scrubbing process runs only while the storage system is in normal mode; that is, the storage system scans the disks only when all disks are operational. Although scrubbing slows the storage system, network clients do not notice the change in the storage system's performance because scrubbing starts automatically at 1:00 a.m. on Sunday when most storage systems are lightly loaded.
Disable scrubbing if you have a recurring problem that scrubbing encounters. For example, there might be an unrecoverable error on a disk that you cannot fix before the next scrub.