Installation guide

4-17
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
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 arrays use the failover assignment if a
disk fails. (Mirror sets and RAID 5 arrays 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.
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