3.1.4 Rebuild/Copyback
When a drive fails and RAID group redundancy is broken, Rebuild/Copyback restores the drive status back to
normal status as a background process. If a free hot spare is available when one of the RAID group drives has
a problem, data of this drive is automatically replicated in the hot spare. This ensures data redundancy.
Copyback can be performed automatically by changing the copyback setting. Copyback is not automatically
performed by default when a failed drive is replaced and the replacement drive is used as a hot spare (Copy-
backless).
Figure 3.4 Rebuild/Copyback Function
Hot spare
Creates data from the drives other than
the failed drive and writes the data
into the hot spare.
After replacing has been completed,
copies the data from the hot spare
to the new drive.
Replaces the failed drive with the new drive.
Failure
Rebuild
Copyback
RAID5 (Redundant)
RAID5 (No redundancy)
RAID5 (Redundant)
RAID5 (Redundant)
Hot spare
Chapter 3 Functions
3.1 Data Protection
27
FUJITSU Storage ETERNUS DX60 S3 Disk storage system
Overview
Copyright 2014 FUJITSU LIMITED
P3AM-8972-01ENZ0
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