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Appendix E Basic Size and MWC Input Condition for RAID Groups
E.1 Basic Size for each RAID Group
ETERNUS Web GUI User’s Guide
Copyright 2013 FUJITSU LIMITED P2X0-1090-10ENZ0
1003
*1: D: Data, M: Mirror, P: Parity
*2: Basic size when creating volumes.
ETERNUS DX80 S2/DX90 S2, ETERNUS DX410 S2/DX440 S2, and ETERNUS DX8100 S2/DX8700 S2 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 E.1
shows what happens when the volume size is an integral multiple of the basic size and what
happens when it is not.
E.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 type Drive
configuration
(*1)
Basic size (MB)
(Lowest exact MB multiple) (*2)
When the Stripe Size is ...
128KB 256KB 512KB 1024KB
High
Performance
(RAID1+0)
2D+2M 16 × Number of
concatenations
16 × Number of
concatenations
16 × Number of
concatenations
16 × Number of
concatenations
3D+3M 63 × Number of
concatenations
63 × Number of
concatenations
15 × Number of
concatenations
15 × Number of
concatenations
4D+4M 16 × Number of
concatenations
16 × Number of
concatenations
16 × Number of
concatenations
16 × Number of
concatenations
5D+5M 125 × Number of
concatenations
15 × Number of
concatenations
15 × Number of
concatenations
15 × Number of
concatenations
6D+6M 63 × Number of
concatenations
15 × Number of
concatenations
15 × Number of
concatenations
12 × Number of
concatenations
7D+7M 63 × Number of
concatenations
63 × Number of
concatenations
14 × Number of
concatenations
14 × Number of
concatenations
8D+8M 16
× Number of
concatenations
16 × Number of
concatenations
16 × Number of
concatenations
16 × Number of
concatenations
9D+9M 63 × Number of
concatenations
63 × Number of
concatenations
27 × Number of
concatenations
9 × Number of
concatenations
10D+10M 15 × Number of
concatenations
15 × Number of
concatenations
15 × Number of
concatenations
10 × Number of
concatenations
11D+11M 121 × Number of
concatenations
55 × Number of
concatenations
11 × Number of
concatenations
11 × Number of
concatenations
12D+12M 15 × Number of
concatenations
15 × Number of
concatenations
12 × Number of
concatenations
12 × Number of
concatenations
13D+13M 117 × Number of
concatenations
13 × Number of
concatenations
13 × Number of
concatenations
13 × Number of
concatenations
14D+14M 63 × Number of
concatenations
14 ×
Number of
concatenations
14 × Number of
concatenations
14 × Number of
concatenations