6
Hardware for FC4700 Storage Systems
6-7
Storage-System Hardware
Data in the cache is protected from power loss by a standby power
supply (SPS). If line power fails, the SPS provides power to let the
storage system write cache contents to the vault disks. The vault
disks are standard disk modules that store user data but have space
reserved outside operating system control. When power returns, the
storage system reads the cache inform ation from the vault disks, and
then writes it to the file systems on the disks. This design ensures that
all write-cached information reaches its destination.
Vault disks are independent of user data storage; a disk’s role as a
vault disk has no affect on its data capacity or performance.
SP Network Connection
Each SP has an Ethernet connection though which the Navisphere
Manager software lets you configure and reconfigure the LUNs and
Storage Groups in the storage system. Each SP connects to a network;
this lets you reconfigure, if needed, should one SP fail.