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Chapter 5 Configuration Menu
> 5.2 RAID Management
ETERNUS DX400/DX8000 series ETERNUSmgr User Guide Settings/Maintenance
162
Copyright 2010 FUJITSU LIMITED
P2X0-0760-02ENZ0
■ The number of selected disks for each RAID Level
■ Restrictions of disk layout
■ Effect of RAID level on LDE disk selection requirements
Disk selection requirements depend on whether or not the RAID level is changed following
the LDE.
*1: "Number of data disks" indicates the number of logical disks in the RAID group th at contain
user data. Different for each RAID level, as follows:
• RAID1(1+1):
→ 1
• RAID1+0(n+n):
→ n
• RAID5(n+1): → n
• RAID6(n+2):
→ n
RAID Level Range of the number of disks
RAID0 2 to 16
RAID1 1+1
RAID1+0 2+2 to 16+16
RAID5 (ETERNUS DX400 series) 2+1 to 15+1
RAID5 (ETERNUS DX8000 series) 3+1 or 7+1
RAID6 (ETERNUS DX400 series) 3+2 to 14+2
RAID6 (ETERNUS DX8000 series) 6+2 or 14+2
RAID Level Disk layout requirements
RAID0 No requirements
RAID1 Mirroring should NOT be in the same FC-Loop.
RAID1+0 Mirroring should NOT be in the same FC-Loop.
RAID5
(ETERNUS DX400 series)
No requirements
RAID5(3+1), RAID5(7+1)
(ETERNUS DX8100)
No requirements
RAID5(3+1)
(ETERNUS DX8400/DX8700)
• Member Disks should NOT be in the same FC-Loop.
• RAID group should be configured in the pair BRT.
RAID5(7+1)
(ETERNUS DX8400/DX8700)
Member Disks should NOT be in the same FC-Loop.
RAID6
(ETERNUS DX400 series)
No requirements
RAID6(6+2), RAID6(14+2)
(ETERNUS DX8100)
No requirements
RAID6(6+2), RAID6(14+2)
(ETERNUS DX8400/DX8700)
3 or more member disks should NOT be in the same FC-
Loop.
Post-LDE RAID Level Disk Selection Requirement
Unchanged
(Same RAID level)
RAID group disks may NOT be deleted by the LDE (total
number of RAID group disks cannot decrease).
Changed
(Different RAID level)
• Number of RAID group data disks(*1) after the LDE
may NOT be less than the number before the LDE.
• RAID group disks may be deleted by the LDE
(however, ALL disks may not be deleted).