Figure 17 Copybackless - Fujitsu ETERNUS DX100 S4 Design Manual

2. Basic Functions
Data Protection
Size (2.5" and 3.5" [including high-density drive enclosures])
•
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 re-
placing 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 set-
•
tings. These settings can be performed with the Storage Management policy or the Mainte-
nance Operation policy. 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 DX100 S4/DX200 S4, ETERNUS DX100 S3/DX200 S3 Hybrid Storage Systems Design Guide (Basic)
RAID5 (Redundant)
RAID5 (Redundant)
RAID5 (Redundant)
37
Copyright 2023 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.
P3AM-7642-32ENZ0