HP Workstation xw6000 Adaptec SCSI RAID 2120S: Software Reference Guide - Page 191

controller Commands controller set automatic_failover Automatic failover allows you to replace a failed disk with a replacement disk. The controller then automatically assigns the disk you insert as a failover disk without your having to first assign it with the array set failover or array set global_failover command. Note that the automatic failover feature works only with disks that reside in a SAF-TE enclosure management device. To turn on or off automatic failover for the specified controller, use the controller set automatic_failover command. ! Caution: The controller deletes any data on the replacement disk when automatic failover is enabled and you remove the failed disk and insert the replacement disk in the failed disk's slot. Notes A failover disk is a disk that you configure to automatically recover data from a failed partition/disk in a redundant array. To assign one or more failover disks for a single array, you use the array set failover command. To assign one or more failover disks for all arrays, you use the array set global_failover command. Although all array types accept failover assignments, only mirror sets and RAID-5 sets use the failover assignment if a disk fails. (Mirror sets and RAID-5 sets are often referred to as redundant arrays). The main characteristic of these commands is that you must "manually" assign the failover disk to one or more arrays. In fact, you might consider the previously described failover mechanism as "manual failover". The controller will assign a replacement drive as a failover disk only if the serial number of the drive is different from the serial number of the drive it replaces. Syntax controller set automatic_failover [/failover_enabled{=boolean}] /failover_enabled{=boolean} 6-19