User Manual

581
Product Manual Technology Background
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
uncongured 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 uncongured 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 Vess subsystem. Transition is
the process of replacing a revertible spare drive that is currently part of a disk array with an uncongured 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 214.
•
Aphysicaldriveassignedtoyourdiskarrayfailsandthearraygoescriticalordegraded.
• Vess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.
• Vess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.