Appendix F Basic Size and MWC Input Condition for RAID Groups
F.2 Input Conditions for MWC
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F.2
Input Conditions for MWC
This section describes the allowed input values for the Multi Writeback Count (MWC).
The allowed input for MWC varies depending on the RAID level, the drive configuration, and the Stripe Depth
value.
F.2.1
Allowed Input for MWC When Using the Default Stripe Depth Value
When using the default Stripe Depth value, refer to the following table for the allowed MWC value:
■
Allowed input for MWC when using the default Stripe Depth value (Volume)
RAID level
Drive configuration (*1)
Allowed input for MWC (initial state)
Stripe Depth = 64KB (default)
Striping (RAID0)
2D
1 – 16 (4)
3D
1 – 10 (3)
4D
1 – 8 (2)
5D
1 – 6 (2)
6D
1 – 5 (2)
7D
1 – 4 (2)
8D
1 – 4 (1)
9D
1 – 3 (1)
10D
1 – 3 (1)
11D – 16D
1 – 2 (1)
Mirroring (RAID1)
1D+1M
1 – 16 (8)
High Performance (RAID1+0)
2D+2M
1 – 16 (4)
3D+3M
1 – 10 (3)
4D+4M
1 – 8 (2)
5D+5M
1 – 6 (2)
6D+6M
1 – 5 (2)
7D+7M
1 – 4 (2)
8D+8M
1 – 4 (1)
9D+9M
1 – 3 (1)
10D+10M
1 – 3 (1)
11D+11M – 16D+16M
1 – 2 (1)
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