Concurrent Rebuild In Raid (0+1) - Acer AcerAltos 3102RS User Manual

Ultra-scsi to ultra-scsi raid controller
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If neither Local Spare Drive nor Global Spare Drive is available, the
controller will detect the SCSI channel and ID of the failed drive. Once
the failed drive has been replaced by a new drive/used drive, it starts
to rebuild using the replaced drive. If there is no available drive for
rebuilding, the controller will not try to rebuild again until the user
applies another forced-manual rebuild.

Concurrent Rebuild in RAID (0+1)

RAID (0+1) allows multiple drive failure and concurrent multiple drive
rebuild. Newly replaced drives must be scanned and set as Local
Spare Drives. These drives will be rebuilt at the same time (you do not
need to repeat the rebuilding process for each drive).
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User's Guide

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