Figure 18 Copybackless - Fujitsu ETERNUS DX500 S4/DX600 S4 Design Manual

2. Basic Functions
Data Protection
Capacity
•
Rotational speed (15,000rpm, 10,000rpm, and 7,200rpm) (*1)
•
• Interface speed (12Gbit/s and 6Gbit/s) (*2)
Drive enclosure transfer rate (12Gbit/s and 6Gbit/s) (*2)
•
*1: For SAS disks or Nearline SAS disks (including SEDs) only.
*2: For SSDs 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 18 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 DX 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.
FUJITSU Storage ETERNUS DX500 S4/DX600 S4, ETERNUS DX500 S3/DX600 S3 Hybrid Storage Systems Design Guide (Basic)
RAID5 (Redundant)
RAID5 (Redundant)
RAID5 (Redundant)
38
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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.
P3AM-7722-25ENZ0