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Promise Technology
Pegasus32 R4/R6/R8
Requirements
The spare drive must:
• Have adequate capacity to replace the largest physical drive in your disk arrays.
• Be the same media type as the physical drives in your disk arrays.
A revertible spare drive requires:
• You to replace the failed physical drive in the disk array
• You to run the Transition function
Transition
Transition is the process of replacing a revertible spare drive that is currently part of a disk array with an
unconguredphysicaldriveoranon-revertiblespare.Therevertiblesparedrivereturnstoitsoriginal
status. In order to run the Transition function, the spare drive must be revertible.
Inaddition,youmustspecifyanunconguredphysicaldriveofthesameorlargercapacityandsame
media type as the revertible spare drive.
Running a Transition
The Transition feature enables you to specify “permanent” spare drives for your Pegasus unit.
Transition is the process of replacing a revertible spare drive that is currently part of a disk array with an
unconguredphysicaldriveoranon-revertiblespare.Therevertiblesparedrivereturnstoitsoriginal
status.
Transition happens automatically when the following sequence of events takes place:
• You create a revertible spare drive. See “Creating a Spare Drive Manually” on page 285.
• A physical drive assigned to your disk array fails and the array goes critical or degraded.
• Pegasus automatically rebuilds your array to the revertible spare drive and the array
becomes functional again.
• You replace the failed physical drive with a new physical drive of equal or greater capacity.
• Pegasus automatically transitions (moves) the data from the revertible spare to the new
physical drive.
• The new physical drive becomes part of the array and the revertible spare drive returns to
its original spare status.
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