Compaq ProLiant CL380 Compaq ProLiant CL380 User Guide - Page 42

Installing the ProLiant CL380 Tower Model 2-3 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.