Administrator Guide
Verifying and scrubbing disk groups
Verify a disk group
If you suspect that a fault-tolerant, mirror or parity, disk group has a problem, run the Verify utility to check the disk group's integrity. For
example, if you haven't checked the system for parity inconsistencies recently and are concerned about the disk health, verify its disk
groups. The Verify utility analyzes the selected disk group to find and fix inconsistencies between its redundancy data and its user data.
This utility fixes parity mismatches for RAID 3, 5, 6, and 50, and finds but not fixes mirror mismatches for RAID 1 and 10. This task can be
performed only on a disk group whose status is fault tolerant and online (FTOL). It cannot be performed for NRAID or RAID 0 read cache
disk groups.
Verification can last over an hour, depending on the size of the disk group, the utility priority, and the amount of I/O activity. You can use a
disk group while it is being verified. When verification is complete, event 21 is logged and specifies the number of inconsistencies found.
Such inconsistencies can indicate that a disk in the disk group is going bad. For information about identifying a failing disk, use the SMART
option. For more information, see Configuring SMART.
If too many utilities are running for verification to start, either wait until those utilities have completed and try again, or abort a utility to
free system resources. If you abort verification, you cannot resume it. You must start the process again from the beginning.
Verify a disk group
1. In the Pools topic, select the pool for the disk group that you plan to verify in the pools table.
NOTE: To see more information about a pool, hover the cursor over the pool in the table. See Viewing pools for more
details about the Pool Information panel that appears.
2. Select the disk group in the Related Disk Groups table.
3. Select Action > Disk Group Utilities.
The Disk Group Utilities panel opens, showing the current job status.
4. Click Verify Disk Group.
A message confirms that verification has started.
5. Click OK.
The panel shows the progress of the disk group verification.
Abort a disk group verification
Perform the following steps to abort a disk group verification:
1. In the Pools topic, select the pool for the disk group that you are verifying in the pools table.
2. Select the disk group in the Related Disk Groups table.
3. Select Action > Disk Group Utilities.
The Disk Group Utilities panel opens, showing the current job status.
4. Click Abort Verify.
A message confirms that verification has been aborted.
5. Click OK.
Scrubbing a disk group
The system-level Disk Group Scrub option automatically checks all disk groups for disk defects. If this option is disabled, you can still
perform a scrub on a selected disk group. A scrub analyzes the selected disk group to find and fix disk errors. A scrub also fixes parity
mismatches for RAID 3, 5 and 6 and ADAPT and mirror mismatches for RAID 1 and 10.
A scrub can last over an hour, depending on the size of the disk group, the utility priority, and the amount of I/O activity. However, a
manual scrub is typically faster than a background scrub. You can use a disk group while it is being scrubbed. When a scrub is complete,
event 207 is logged and specifies whether errors were found and whether user action is required.
Scrub a disk group
1. In the Pools topic, select the pool for the disk group that you plan to scrub in the pools table.
2. Select the disk group in the Related Disk Groups table.
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Working in the Pools topic