Chapter 4: Technology Background
93
• 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 unconfigured physical drive or a non-revertible spare. The
revertible spare drive returns to its original status. In order to run the Transition
function, the spare drive must be revertible.
In addition, you must specify an unconfigured physical drive of the same or larger
capacity and same 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 unconfigured physical drive or a non-
revertible spare. The revertible spare drive returns to its original 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 69.
• 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.
Transition happens manually when you specify a different unconfigured physical
drive to transition (move) the data from the revertible spare drive.
See the example on the following pages.
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