HP Surestore Disk Array FC60 HP SureStore E Disk Array 12H User's and Service - Page 33

Controller Chapter 2. HP SureStore E Disk Array 12H Controller This chapter explains how to install batteries, download firmware into a disk array controller, and how to replace an array controller. About Battery Packs If your disk array goes without power, the controller batteries are capable of retaining data in NVRAM for a minimum of one week. Always perform a successful Shutdown before replacing the batteries. For further protection, battery packs should be replaced one at a time, so that there is always at least one battery providing power for memory backup. If the disk array power is to be turned off for an extended period of time (more than five days), then the NVRAM memory maps should be saved to disk (by successful Shutdown) and both battery packs should be disconnected to prevent damage to the battery packs and the controller. 33