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
*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.
shows what happens when the volume size is an integral
multiple of the basic size and what happens when it is not.
Reliability
(RAID5+0)
(2D+1P)x2
16 x Number of concatenations
(3D+1P)x2
63 x Number of concatenations
(4D+1P)x2
16 x Number of concatenations
(5D+1P)x2
125 x Number of concatenations
(6D+1P)x2
63 x Number of concatenations
(7D+1P)x2
63 x Number of concatenations
(8D+1P)x2
16 x Number of concatenations
(9D+1P)x2
63 x Number of concatenations
(10D+1P)x2
15 x Number of concatenations
(11D+1P)x2
121 x Number of concatenations
(12D+1P)x2
15 x Number of concatenations
(13D+1P)x2
117 x Number of concatenations
(14D+1P)x2
63 x Number of concatenations
(15D+1P)x2
15 x Number of concatenations
High Reliability
(RAID6)
3D+2P
255 x Number of concatenations
4D+2P
16 x Number of concatenations
5D+2P
255 x Number of concatenations
6D+2P
63 x Number of concatenations
7D+2P
63 x Number of concatenations
8D+2P
16 x Number of concatenations
9D+2P
63 x Number of concatenations
10D+2P
125 x Number of concatenations
11D+2P
253 x Number of concatenations
12D+2P
63 x Number of concatenations
13D+2P
247 x Number of concatenations
14D+2P
63 x Number of concatenations
RAID level
Drive configuration (*1)
Basic size (MB) (Lowest exact MB multiple) (*2)
(Stripe Depth = 64KB (default))
Summary of Contents for Eternus DX200F
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