D Efinition - Asus DS300j G2 Series User Manual

s d
pare rIves
Spare drive technology includes:
• "Definition" on page 193
• "Options" on page 193
• "Requirements" on page 193
• "Transition" on page 193
D
efInItIon
A spare drive is a physical drive that you designate to automatically replace the failed physical drive in a disk
array.
The general recommendation is to:
• Provide at least one spare drive for every 16 physical drives in the RAID system
• Configure the spares as global revertible spare drives
o
PtIonS
There are several options you can specify for a spare drive:
• System Options
• Revertible – Returns to its spare drive assignment after you replace the failed
physical drive in the disk array and run the Transition function.
• Media Patrol – By default, Media Patrol runs on spare drives unless you disable it.
• Spare Type
• Global – Can be used by any disk array
• Dedicated – Can be used only by the assigned disk array
• Media Type (type of physical drive)
• Hard Disk Drive (HDD)
• Solid State Drive (SSD)
193
r
equIrementS
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
t
ranSItIon
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.
r t
unning A rAnsition
The Transition feature enables you to specify "permanent" spare drives for your ASUS DS300f G2 subsystem.
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 102.
• A physical drive assigned to your disk array fails and the array goes critical or degraded.
• ASUS DS300f G2 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.
• ASUS DS300f G2 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
DS300f G2 Series User Manual