Kofax Communication Server 9.1 - Manual (Page 79)

Environment Guide Version 3.00.04
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Enable write caching on the disk only if the KCS is connected to an uninterruptible power supply (UPS).
Otherwise power failures may leave the TCOSS file system in an inconsistent state.
Write caching on the disk improves the speed of random writes considerably, for a rough estimate take a
factor of 2.
HW RAID Configurations
For increased disk throughput use a HW RAID configuration in combination with battery-backed write cache
on the disk controller.
It‟s recommended to use RAID 1+0 (mirrored sets in a striped set). Also possible is RAID 0 for each half of
a tandem system. RAID 5 is not recommended, it performs poorly on random writes.