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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
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E.2 Input Conditions for MWC
This section describes the allowed input values for the Multi Writeback Count (MWC).
The allowed input for the MWC varies depending on the RAID type, the drive configuration, and the Stripe
Depth value.
E.2.1 Allowed Input for the 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 type 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)