Compaq ProLiant CL380 User Guide

Installing the ProLiant CL380 Tower Model 2-3
Compaq Confidential – Need to Know Required
Writer: Marcello Frau Project: Compaq ProLiant CL380 User Guide Comments:
Part Number: 118128-003 File Name: c-ch2 Installing a Tower ProLiant CL380.doc Last Saved On: 8/28/00 4:33 PM
The Optimum Environment
When installing the Compaq ProLiant CL380, certain accessibility,
temperature, and power requirements must be met.
Data Protection for High-Availability Environment
In environments where data must be protected, it is strongly recommended that
an uninterruptible power supply (UPS) be used. The UPS provides time in the
event of a power failure to complete any transactions in process and to empty
the data in processor and controller caches to permanent disk storage. The
UPS protects data being processed in the event of electrical power loss to the
ProLiant CL380. Without a UPS, transactions in process are not completed
and the data being processed would be lost. To maximize performance, the
CR3500 RAID Controller write-back cache reports a transaction as complete
once the data is in cache.
CAUTION: The Shared Storage RAID Controller CR3500 does not contain a
battery-backed cache. Compaq recommends that the system be connected to
an uninterruptible power supply (UPS). Operating the system without a UPS
could cause data corruption in the event of a power failure.
IMPORTANT: In the event of loss of power, this data in cache is lost and erroneous
results are reported. Use of a properly sized UPS provides sufficient time for all results in
both the server and the CR3500 RAID Controller cache memory to be recorded to
permanent disk storage.
An alternative to the use of a UPS is to disable the CR3500 RAID Controller
write-back cache; however, this reduces system performance.