•
Redundant Copy speed
Giving priority to Redundant Copy over host access can be specified. By setting a higher Re-
build priority, the performance of Redundant Copy operations may improve.
However, it should be noted that when the priority is high and a Redundant Copy operation is
performed for a RAID group, the performance (throughput) of this RAID group may be re-
duced.
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)
Dis
connection
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 prior-
ity, the performance 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.
2. Basic Functions
Data Protection
34
Fujitsu Storage ETERNUS DX100 S4/DX200 S4, ETERNUS DX100 S3/DX200 S3 Hybrid Storage Systems
Design Guide (Basic)
Copyright 2023 Fujitsu Limited
P3AM-7642-32ENZ0
To Next Page
Loading...
