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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
999
*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.
Reliability
(RAID5+0)
(2D+1P) × 2 16 × Number of concatenations
(3D+1P) × 2 63 × Number of concatenations
(4D+1P) × 2 16 × Number of concatenations
(5D+1P) × 2 125 × Number of concatenations
(6D+1P) × 2 63 × Number of concatenations
(7D+1P) × 2 63 × Number of concatenations
(8D+1P) × 2 16 × Number of concatenations
(9D+1P) × 2 63 × Number of concatenations
(10D+1P) × 2 15 × Number of concatenations
(11D+1P) × 2 121 × Number of concatenations
(12D+1P) × 2 15 × Number of concatenations
(13D+1P) × 2 117 × Number of concatenations
(14D+1P) × 2 63 × Number of concatenations
(15D+1P) × 2 15 × Number of concatenations
High Reliability
(RAID6)
3D+2P 255 × Number of concatenations
4D+2P 16 × Number of concatenations
5D+2P 255 × Number of concatenations
6D+2P 63 × Number of concatenations
7D+2P 63 × Number of concatenations
8D+2P 16 × Number of concatenations
9D+2P 63 × Number of concatenations
10D+2P 125 × Number of concatenations
11D+2P 253 × Number of concatenations
12D+2P 63 × Number of concatenations
13D+2P 247 × Number of concatenations
14D+2P 63 × Number of concatenations
RAID type Drive configuration (*1) Basic size (MB) (Lowest exact MB multiple) (*2)
(Stripe Depth = 64KB (default))