Auto Disk Spin-down
When the disk drives have not been accessed or are not scheduled to be accessed for a set time defined by you, the auto disk spin down functionality will kick in, and will power down the whole storage pool into a hibernation state, this gives you the freedom to optimize the energy usage of the XS3200 SAN storage system. Disk spin-down can save 60% to 70% power in low use scenarios such as backups. When the system detects a read/write requests coming in, it will issue a wake command, this takes a few seconds to spin up all the disk drives in the storage pool to resume all data services. The performance penalty can be off-set with SSD cache, however.