Figure 15 Copybackless - Fujitsu ETERNUS DX S5 Series Design Manual

2. Basic Functions
Data Protection
• Size (2.5" and 3.5" [including drives for high-density drive enclosures])
Capacity
•
• Rotational speed (15,000rpm, 10,000rpm, and 7,200rpm) (*1)
*1: For SAS disks or Nearline SAS disks (including SEDs) only.
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 15 Copybackless
Failed drive
Hot spare
Hot spare
Caution
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.
Note
To set the Copybackless function, use the subsystem parameter settings. These settings can be performed
with the Storage Management policy or the Maintenance Operation policy. After the settings are changed,
the ETERNUS DX does not need to be turned off and on again.
RAID5 (Redundant)
RAID5 (Redundant)
RAID5 (Redundant)
54
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.
Design Guide