HP P3410A HP NetRAID Series User Guide - Page 65

Chapter 3 HP NetRAID Config Logical Drive Settings Auto Configuration uses the following defaults to configure your drives: Table 3-1. HP NetRAID Config Automatic Settings for Logical Drives Parameter Stripe size Write Policy Read Policy Cache Policy Spanning Setting 64 KB Write-Back in HP NetRAID-3Si and integrated HP NetRAID in HP NetServer LH 3000/3000r, LH 6000/6000r, and LT 6000r (See note below table.) Write-Through in HP NetRAID-1Si and integrated HP NetRAID in HP NetServer LH 3/3r and LH 4/4r Adaptive Cached I/O NoSpan 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: • 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. Write-Back is not certified for any logical drive used as a Novell NetWare volume. 59