Rebuild
Rebuild processes recover data in failed drives by using other drives. 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.
Figure 14 Rebuild
Disconnects the failed drive to the ETERNUS
storage system and creates data from the drives
other than the failed drive and writes the data
into the hot spare.
Rebuild
Hot spare
Failed drive
Configures the hot spare in the RAID group.
Failure
RAID5 (No redundancy)
RAID5 (Redundant)
Disconnection
When no hot spares are registered, rebuilding processes are only performed when a failed drive is replaced or
when a hot spare is registered.
•
Rebuild Speed
Giving priority to rebuilding over host access can be specified. By setting a higher rebuild priority, the per-
formance of rebuild operations may improve.
However, it should be noted that when the priority is high and a rebuild operation is performed for a RAID
group, the performance (throughput) of this RAID group may be reduced.
1. Function
Data Protection
32
FUJITSU Storage ETERNUS AF250 S2, ETERNUS AF250 All-Flash Arrays
Design Guide (Basic)
Copyright 2019 FUJITSU LIMITED
P3AG-1822-09ENZ0
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