Hitachi 220H Bios Manual page 135

2. The following window is displayed.
From the list displayed in the upper right pane, click a virtual drive to change
write policy, and then check Properties > Go.
3. The following window is displayed.
Select the write policy from Default Write displayed in the Policies pane.
The setting is shown in the following table.
Table 2-20: Default Write settings
Setting
Always Write Back
Write Through
Write Back With BBU
Hitachi Compute Rack 210H/220H BIOS Guide
Description
Write cache is enabled.
Write cache is disabled.
Write cache is enabled only when a cache backup module is
connected to the RAID controller.
MegaRAID WebBIOS 2-71