Appendix F Basic Size and MWC Input Condition for RAID Groups
F.1 Basic Size for each RAID Group
ETERNUS Web GUI User’s Guide (Settings)
Copyright 2015 FUJITSU LIMITED P2X0-1270-13ENZ0
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*1: D: Data drives, M: Mirror drives, P: Parity drives, HS: Hot Spares
*2: Basic size when creating volumes.
The ETERNUS DX manages volumes in units of stripe size. If the volume size is not an exact multiple of the basic size
(stripe size), then when a RAID group is created the remainder at the end of the last stripe used will be lost. Stripe
size is independent of the disk drive capacity. Figure F.1
shows what happens when the volume size is an integral
multiple of the basic size and what happens when it is not.
Figure F.1 Basic size when creating volumes
High Reliability
(RAID6-FR)
(3D+2P)x2+1HS 3
(4D+2P)x2+1HS 1
(6D+2P)x2+1HS 3
(9D+2P)x2+1HS 9
(12D+2P)x2+1HS 3
(5D+2P)x4+1HS 5
(13D+2P)x2+1HS 13
(8D+2P)x3+1HS 1
(4D+2P)x5+1HS 1
(3D+2P)x6+1HS 3
RAID level Drive configuration (*1) Basic size (MB) (Lowest exact MB multiple) (*2)
(Stripe Depth = 64KB (default))
Unusable area
Unusable area
RAID Group B
Volume 1
Volume 2
Basic size
RAID group A
Volume 1
Volume 2
Basic size
Volume size is the exact multiple of basic size Volume size is not the exact multiple of basic size
Next volume is created from the next boundary Next volume is created from the next boundary
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