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Appendix E Basic Size and MWC Input Condition for RAID Groups
E.2 Input Conditions for MWC
ETERNUS Web GUI User’s Guide
Copyright 2013 FUJITSU LIMITED P2X0-1090-10ENZ0
1009
*1: D: Data drives, M: Mirror drives, P: Parity drives
E.2.2 Allowed Input for the MWC when Performance is Tuned
Refer to the following table for the allowed MWC value when the Stripe Depth value is changed:
■ Allowed Input for MWC when the Stripe Depth value is tuned (Volume)
*1: D: Data drives, M: Mirror drives, P: Parity drives, –: Stripe Depth cannot be changed
High Reliability (RAID6)
4D+2P 1 – 8 (2)
6D+2P 1 –- 5 (2)
8D+2P 1 – 4 (1)
RAID type Drive configuration (*1) Allowed input for MWC (initial state)
Stripe Depth = 64KB (default)
RAID type Drive configuration
(*1)
Allowed input for MWC (initial state)
When the Stripe Size is ...
128KB 256KB 512KB 1024KB
Striping (RAID0)
2D 1 – 8 (4) 1 – 4 (4) 1 – 2 (2) 1 (fixed)
3D 1 – 5 (3) 1 – 2 (2) 1 (fixed) 1 (fixed)
4D 1 – 4 (2) 1 – 2 (2) 1 (fixed) 1 (fixed)
5D 1 – 3 (2) 1 (fixed) 1 (fixed) 1 (fixed)
6D 1 – 2 (2) 1 (fixed) 1 (fixed) 1 (fixed)
7D 1 – 2 (2) 1 (fixed) 1 (fixed) 1 (fixed)
8D 1 – 2 (1) 1 (fixed) 1 (fixed) 1 (fixed)
9D – 16D 1 (fixed) 1 (fixed) 1 (fixed) 1 (fixed)
High Performance
(RAID1+0)
2D+2M 1 – 8 (4) 1 – 4 (4) 1 – 2 (2) 1 (fixed)
3D+3M 1 – 5 (3) 1 – 2 (2) 1 (fixed) 1 (fixed)
4D+4M 1 – 4 (2) 1 – 2 (2) 1 (fixed) 1 (fixed)
5D+5M 1 – 3 (2) 1 (fixed) 1 (fixed) 1 (fixed)
6D+6M 1 – 2 (2) 1 (fixed) 1 (fixed) 1 (fixed)
7D+7M 1 – 2 (2) 1 (fixed) 1 (fixed) 1 (fixed)
8D+8M 1 – 2 (1) 1 (fixed) 1 (fixed) 1 (fixed)
9D+9M – 16D+16M 1 (fixed) 1 (fixed) 1 (fixed) 1 (fixed)
High Capacity (RAID5)
2D+1P 1 – 4 (4) 1 – 2 (2) 1 (fixed) –
3D+1P 1 – 4 (3) 1 – 2 (2) 1 (fixed) –
4D+1P 1 – 4 (2) 1 – 2 (2) 1 (fixed) –
5D+1P 1 – 3 (2) 1 (fixed) – –
6D+1P 1 – 2 (2) 1 (fixed) – –
7D+1P 1 – 2 (2) 1 (fixed) – –
8D+1P 1 – 2 (1) 1 (fixed) – –
9D+1P – 15D+1P 1 (fixed) – – –