Chapter 1 Overview
> 1.3 Functions
ETERNUS DX60/DX80/DX90 Disk storage system User Guide
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Copyright 2010 FUJITSU LIMITED
P3AM-3042-06ENZ0
1.3 Functions
This section describes the main ETERNUS DX60/DX80/DX90 functions.
1.3.1 Rebuild/Copyback
When a disk fails and the RAID group redundancy has been broken, Rebuild/Copyback restores
the disk status back to normal status as a background process.
Figure 1.10 Rebuild/Copyback function
Hot Spare
Hot Spare
Creates data from the disks other than
the failed disk and writes the data into
the hot spare.
After replacing has been completed,
copies the data from the hot spare
to the new disk.
Replaces the failed disk with the new disk.
Failure
Rebuild
Copyback
RAID5 (Redundant)
RAID5 (No Redundancy)
RAID5 (Redundant)
RAID5 (Redundant)
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