AMCC 720-0138-00 manual Rebuilding Units, To verify a unit through 3DM

Background Tasks

To verify a unit through 3DM

1In 3DM, choose Management > Maintenance.

2In the Unit Maintenance section of the Maintenance page, select the unit you want to verify and click Verify Unit.

3DM puts the selected unit in verifying mode. If verify scheduling is not enabled on the Scheduling page, the verification process begins almost immediately. If verify scheduling is enabled, the unit will not start actively verifying until the next scheduled time.

A Stop Verify link appears next to the unit on the Maintenance page. If you need to stop the verify process, use this link. (If initialization starts because the unit had not previously been initialized, it cannot be halted, so no Stop Verify link appears.)

Rebuilding Units

Rebuilding is the process of generating data on a new drive after it is put into service to replace a failed drive in a fault tolerant unit.

If a hot spare is specified and a redundant unit degrades, it will be used to automatically replace the failed drive in the redundant unit without intervention on your part. The rebuild process will automatically be launched as a background process at the next scheduled time. If scheduling is turned off, the rebuild process will start almost immediately (within a couple of minutes). If 3DM is running and E-mail notification is enabled, an event notification will be sent to specified users when the unit degrades and again when the rebuild process is complete.

If the Auto Rebuild policy is enabled (see “Setting the Auto Rebuild Policy” on page 31), the firmware will attempt to rebuild a degraded unit with an available drive or a failed drive.

If desired, you can manually replace the drive, rescan the controller, and start the rebuild process. Rebuilds on multiple units can take place simultaneously.

If multiple drives are faulted in a RAID 10 configuration, the drives are rebuilt simultaneously. In a 4-drive RAID 10 configuration, up to two drives can be rebuilt.

Note: If both drives in a RAID 10 mirrored set are faulted, the data is not recoverable. Up to half of the drives in a RAID 10 unit can become defective and still have the user data retained, as long as the failed drives are only half of each mirrored pair.

When a RAID 5 is running in Degraded mode and you rebuild it, the missing data is reconstructed from all functioning drives.

www.3ware.com 73