Hitachi 220H Bios Manual page 100

12. Click Accept.
13. The following window is displayed. Click Yes.
– When you specify Write Through to Write Policy
– When you specify Always Write Back to Write Policy
– When you specify Write Back With BBU to Write Policy
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If multiple virtual drives reside on the same Drive Group, keep the
same setting for all the virtual drives.
If you specify a larger disk array size than the maximum capacity,
Unacceptable size is displayed on the window and all the setting
items are initialized. You need to reset all items to the correct size.
MegaRAID WebBIOS
Hitachi Compute Rack 210H/220H BIOS Guide