Chapter 5 RAID Group Management
5.5 Expand RAID Group
ETERNUS Web GUI User’s Guide (Settings)
Copyright 2015 FUJITSU LIMITED P2X0-1270-13ENZ0
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Availability of LDE for each combination of RAID levels
The following table shows availability of LDE functions (changing RAID levels or capacity expansion by adding
drives).
OK: LDE is available, N/A: LDE is not available
• Before expanding the RAID group, back up data in all the logical volumes in the target RAID group to a
different location. If not, data cannot be recovered when expansion fails. If expansion fails, data can be
recovered from the backed up data.
• RAID Group Expansion can only be performed for one RAID group at a time.
• RAID Group Expansion cannot be suspended.
• The following functions cannot be used for RAID groups in which RAID Group Expansion is being
performed:
- Format volume
- Create volume
- Encrypt volume
- RAID migration for the volume
- Expand volume
- Preventive maintenance
- Diagnosis for RAID group
- Diagnosis for disks
• For some combinations of RAID levels, LDE cannot be used. Refer to "Availability of LDE for each
combination of RAID levels" (page 541) for details.
• RAID groups can be expanded when the RAID group capacity after performing expansion is the same or
larger than the current RAID group capacity.
• When expanding the drive capacity that configures a RAID group, use the procedure in "3.9 Start RAID
Migration" (page 301) instead of this function.
• In the controller firmware versions V10L31 and earlier, "SED" indicates "Online SED".
RAID level after changing
RAID0 RAID1 RAID1+0 RAID5 RAID5+0 RAID6 RAID6-FR
RAID level
before
changing
RAID0 OK N/A OK OK N/A OK N/A
RAID1 N/A N/A OK OK N/A OK N/A
RAID1+0 N/A N/A OK OK N/A OK N/A
RAID5 N/A N/A OK OK N/A OK N/A
RAID5+0 N/A N/A N/A N/A N/A N/A N/A
RAID6 N/A N/A OK OK N/A OK N/A
RAID6-FR N/A N/A N/A N/A N/A N/A N/A
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