Fujitsu Eternus DX200F, User Manual

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Appendix F Basic Size and MWC Input Condition for RAID Groups
F.1 Basic Size for each RAID Group
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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.
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.
F.1.4 Basic Size When Stripe Depth is Tuned (For WSV Type Volumes)
Refer to the following table for the basic size of RAID groups when the Stripe Depth value is changed:
■ Basic size of each RAID group when the Stripe Depth value is tuned
For WSVs, the basic size is a multiple of the number of concatenations (the number of RAID groups that are to
be concatenated).
When the Wide Stripe Size is "Normal"
RAID level Drive
configuration
(*1)
Basic size (MB)
(Lowest exact MB multiple) (*2)
When the Stripe Depth is ...
128KB 256KB 512KB 1024KB
High
Performance
(RAID1+0)
2D+2M 16 x Number of
concatenations
16 x Number of
concatenations
16 x Number of
concatenations
16 x Number of
concatenations
3D+3M 63 x Number of
concatenations
63 x Number of
concatenations
15 x Number of
concatenations
15 x Number of
concatenations
4D+4M 16 x Number of
concatenations
16 x Number of
concatenations
16 x Number of
concatenations
16 x Number of
concatenations
5D+5M 125 x Number of
concatenations
15 x Number of
concatenations
15 x Number of
concatenations
15 x Number of
concatenations
6D+6M 63 x Number of
concatenations
15 x Number of
concatenations
15 x Number of
concatenations
12 x Number of
concatenations
7D+7M 63 x Number of
concatenations
63 x Number of
concatenations
14 x Number of
concatenations
14 x Number of
concatenations
8D+8M 16 x Number of
concatenations
16 x Number of
concatenations
16 x Number of
concatenations
16 x Number of
concatenations
9D+9M 63 x Number of
concatenations
63 x Number of
concatenations
27 x Number of
concatenations
9 x Number of
concatenations
10D+10M 15 x Number of
concatenations
15 x Number of
concatenations
15 x Number of
concatenations
10 x Number of
concatenations
11D+11M 121 x Number of
concatenations
55 x Number of
concatenations
11 x Number of
concatenations
11 x Number of
concatenations
12D+12M 15 x Number of
concatenations
15 x Number of
concatenations
12 x Number of
concatenations
12 x Number of
concatenations
13D+13M 117 x Number of
concatenations
13 x Number of
concatenations
13 x Number of
concatenations
13 x Number of
concatenations
14D+14M 63 x Number of
concatenations
14 x Number of
concatenations
14 x Number of
concatenations
14 x Number of
concatenations