Dell POWERVAULT MD3620I Owner's Manual page 118

To select nonadjacent virtual disks, press <Ctrl> click. To select adjacent
virtual disks, press <Shift> click. To select all of the available virtual disks,
click Select All.
4 In the Select cache properties area, you can select:
• Enable read caching—to enable read caching.
• Enable dynamic cache read prefetch—to enable dynamic cache read
prefetch.
Enable write caching—to enable write caching.
•
Enable write caching with mirroring—to mirror cached data
•
across two redundant RAID controller modules that have the
same cache size.
• Enable write caching without batteries—to permit write caching
to continue even if the RAID controller module batteries are
discharged completely, not fully charged, or are not present.
CAUTION:
batteries option allows write caching to continue even when the batteries are
discharged completely or are not fully charged. Typically, write caching is turned
off temporarily by the RAID controller module until the batteries are charged. If you
select this option and do not have a universal power supply for protection, you
could lose data. In addition, you could lose data if you do not have RAID controller
module batteries and you select the Enable write caching without batteries
option.
NOTE:
the Enable write caching is not displayed. The Enable write caching without
batteries is still available, but it is not checked by default.
NOTE:
box is disabled.
5 Click OK.
A message prompts you to confirm the change in the virtual disk
modification priority.
6 Click Yes.
7 Click OK.
118
Configuration: Disk Groups and Virtual Disks
Possible loss of data—Selecting the Enable write caching without
When the Optional RAID controller module batteries option is enabled,
Cache is automatically flushed after the Enable write caching check