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002A Verify failed
Event Type
Error
Cause
Verification of a unit has terminated with an error. For each RAID level being verified, this may mean:

| Single. A single drive returned an error, possibly because of a media defect.

| RAID 0. A single drive returned an error, possibly because of a media defect.

| RAID 1 and 10. One side of the mirror does not equal the other side.

| RAID 5, 6, and 50. The parity data does not equal the user data.

For any RAID type, the most likely cause of the error is a grown defect in the drive. For out-of-synchronization mirrors or parity, the error could be caused by improper shutdown of the unit. This possibility applies to RAID 1, 5, 6, 10, and 50.
Action
When a verify fails, redundant units will automatically resynchronize user data through a background initialization. The initialize will not erase user data, but will recalculate and rewrite user parity data.
If the unit was non-redundant, any data in the error location is lost. (However, the error could be in a part of the drive that did not contain data.) A unit file system check is recommended.
Under Windows, right-click on your drive icon and choose Properties >> Tools >> Check Now.
For Mac OS X, you can use the First Aid tab in the Disk Utility—select the disk on the left and then click Verify Disk. If verification encounters problems, you can then use the Repair Disk option on the same screen.
Under Linux and FreeBSD use the fsck command.
For OpenSolaris and VMware you should follow your operating system’s guide to perform a file system check.
The resynchronization of data that takes place during a background initialization can slow down access to the unit. Once initialization has begun, it cannot be canceled. You can pause it, however, by scheduling it to take place during off-hours. For more information, see Scheduling Background Tasks. You can also set the initialization process to go slower and use fewer system resources. For more information, see Setting Background Task Rate. (Initialization occurs at the Rebuild rate.)
See Also
About Initialization

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