Figure 17 Copybackless - Fujitsu ETERNUS AF250 Design Manual

1. Function
Data Protection
If different types of drives have been selected as the hot spare, copyback is performed after replacing the drives
even when the Copybackless function is enabled.
The Copybackless function can be enabled or disabled. This function is enabled by default.

Figure 17 Copybackless

Failed drive
Hot spare
Hot spare
To set the Copybackless function for each storage system, use the subsystem parameter settings. These set-
•
tings can be performed with the system management/maintenance operation privilege. After the settings
are changed, the ETERNUS AF does not need to be turned off and on again.
If the Copybackless function is enabled, the drive that is replaced with the failed drive cannot be installed in
•
the prior RAID group configuration. This should be taken into consideration when enabling or disabling the
Copybackless function.
RAID5 (Redundant)
RAID5 (Redundant)
RAID5 (Redundant)
FUJITSU Storage ETERNUS AF250 S2, ETERNUS AF250 All-Flash Arrays Design Guide (Basic)
Copyright 2019 FUJITSU LIMITED
After rebuilding is complete, the RAID group
configuration drive is replaced
by the hot spare.
The failed drive (hot spare) is
replaced by the new drive.
The replaced drive becomes a hot spare in
the storage system.
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