HP P3410A - NetRAID 1M RAID Controller User Manual page 18

Chapter 1
NOTE Write-Back means that data is written to disk only when it is
forced out of the cache. Write-Back is efficient because an
entry may be written many times in the cache without a disk
access. While this setting increases performance, data can be
lost if power fails.
Write-Back is NOT recommended unless one of the following
is true:
Write-Back is not certified for any logical drive used as a
Novell NetWare volume.
12
The HP NetRAID adapter is an HP NetRAID-3Si, which
has a Battery Backup Unit.
Your system is equipped with a UPS (uninterruptible
power supply).
Your system is an HP NetServer LH 3000/3000r,
LH 6000/6000r, or LT 6000r that is equipped with a
charged accessory Battery Backup Module.
Overview of HP NetRAID Utilities