Appendix A Parameter List
A.1 System Management
ETERNUS Web GUI User’s Guide (Settings)
Copyright 2015 FUJITSU LIMITED P2X0-1270-13ENZ0
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● Setup Disk Drive
• Checkcode Enforcement
• Copybackless
Description Select whether to enable or disable the Checkcode Enforcement mode.
Input condition/
Display contents
• Enable
Error detection function in the ETERNUS DX is enhanced.
When data is duplicated, the check codes of all the data blocks are checked.
• Disable
Error detection in the ETERNUS DX is performed with the normal procedure.
• Do not change the default setting ("Enable") for normal use.
• If "Disable" is selected, the detection performance when errors occur is reduced.
Description Select whether to enable or disable the Copybackless function.
The Copybackless function registers the rebuilding destination hot spare in the RAID
group after rebuilding is complete instead of performing a copyback operation. The
failed drive in the RAID group is changed to a hot spare after the rebuilding is complete.
If the failed drive is replaced with a normal drive, the replacement drive can be used as a
hot spare. After the redundant copy is complete, this function is performed in the same
way as the rebuilding function. Both types of hot spares (Global Hot Spares and
Dedicated Hot Spares) can be the target hot spares for this function.
The Copybackless function is performed when the following hot spares are selected.
• Hot spares that are the same type as the target drive (Online/Nearline/SSD/Online
SED/Nearline SED/SSD SED)
• Hot spares that are the same type as the target SSD (SSD-M/SSD/SSD-M SED)
• Hot spares with the same capacity as the target drive
• Hot spares with the same speed as the target drive
Input condition/
Display contents
• Enable
• Disable
If the Copybackless function is enabled, a normal drive that replaces the failed drive cannot return to the original
RAID group configuration. This should be taken into consideration when determining whether to enable or disable
the Copybackless function.
The Copybackless function is not performed when the first drive fails in a "RAID6-FR" type RAID group. A high-speed
rebuild is performed in a hot spare area within the RAID group, and when the failed drive is exchanged for a normal
drive, copyback is performed. The Copybackless setting is applied when the second drive fails.
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