A redundancy check determines whether the data on a volume in a pool or volume group is consistent. Redundancy data is used to quickly reconstruct information on a replacement drive if one of the drives in the pool or volume group fails.
You can perform this check only on one pool or volume group at a time. A volume redundancy check performs the following actions:
Scans the data blocks in a RAID 3 volume, a RAID 5 volume, or a RAID 6 volume, and then checks the redundancy information for each block. (RAID 3 can only be assigned to volume groups using the command line interface.)
Compares the data blocks on RAID 1 mirrored drives.
Returns redundancy errors if the data is determined to be inconsistent by the controller firmware.