AMCC 720-0138-00 manual Starting a Verify Manually, How Errors Are Handled

Chapter 6. Maintaining Units

How Errors Are Handled

Verification makes use of the same error checking and error repair techniques used during ordinary use of drives configured through 3ware RAID controllers.

When verification encounters an error, the controller typically retries the command. If there are cable CRC errors, there may be multiple retries including downgrade of the UDMA mode. If the error persists and is unrepairable (e.g., ECC errors), an error notification is issued to indicate the problem. (See AEN “0026 Drive ECC error reported” on page 122.)

If the disk drive is part of a redundant unit that is in a redundant state (not degraded or rebuilding), then Dynamic Sector Repair automatically rewrites the redundant data to the error location to force the drive to reallocate the error location. A notification of repair is posted to the alarms list. The result is a restoration of drive and data integrity; the primary and redundant data are again both valid.

If the unit is not redundant, it is recommended that you perform a file-system check to correct the issue. On Mac OS X, you can do this using 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.If the errors persist and cannot be overwritten from a backup copy, perform a final incremental backup. You will need to replace the defective drive, recreate the array, and reinstall the data.

Starting a Verify Manually

Verification of units can be done automatically, on a schedule, or can be started manually, as described below. (See “Setting Auto Verify for a Unit” on page 46 and “Scheduling Background Tasks” on page 76.)

Note: If the unit has not previously been initialized and you manually select Verify

Unit the initialization process starts.

72 3ware Serial ATA RAID Controller User Guide for the Power Mac G5