Hitachi Compute Blade 500 Series User Manual page 259

– When you select Write Back with BBU in the write policy setting, the
following window appears. Click Yes.
Tip: When Write Back With BBU is set as Write policy to the unit with a
cache backup module installed* and the cache backup module status is
checked, the following window appears. Click Yes.
*. Present is shown for Battery Backup in Properties: Controller
properties submenu 2 on page 4-14.
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MegaRAID WebBIOS for storage expansion blades
Hitachi Compute Blade 500 Series EFI User's Guide