Loading ...
Loading ...
Loading ...
4545
Level Description
00 Congure a RAID 00 by spanning two or more contiguous RAID 0 virtual drives, up
to the maximum number of supported devices for the controller.
10 Congure RAID 10 by spanning two or more contiguous RAID 1 virtual drives, up
to the maximum number of supported devices for the controller. A RAID 10 drive
group supports a maximum of 8 spans. You must use an even number of drives in
each RAID virtual drive in the span. The RAID 1 virtual drives must have the same
stripe size.
50 Configure a RAID 50 drive group by spanning two or more contiguous RAID 5
virtual drives. The RAID 5 virtual drives must have the same stripe size.
60 Configure a RAID 60 drive group by spanning two or more contiguous RAID 6
virtual drives. The RAID 6 virtual drives must have the same stripe size.
Hot Spares
A hot spare is an extra, unused drive that is part of the disk subsystem. It is usually in Standby mode,
ready for service if a drive fails. Hot spares let you replace failed drives without system shutdown or
user intervention. The MegaRAID SAS RAID controllers can implement automatic and transparent
rebuilds of failed drives using hot spare drives, which provide a high degree of fault tolerance and zero
downtime.
The RAID management software lets you specify drives as hot spares. When a hot spare is needed, the
RAID controller assigns the hot spare that has a capacity closest to and at least as great as that of the
failed drive to take the place of the failed drive. The failed drive is removed from the virtual drive and
marked ready awaiting removal after the rebuild to a hot spare begins. You can make hot spares of the
drives that are not in a RAID virtual drive.
You can use the RAID management software to designate the hot spare to have enclosure affinity,
which means that if drive failures are present on a split backplane conguration, the hot spare will be
used rst on the backplane side in which it resides.If the hot spare is designated as having enclosure
anity, it tries to rebuild any failed drives on the backplane in which it resides before rebuilding any
other drives on other backplanes.
The hot spare can be of two types:
• Global hot spare
• Dedicated hot spare
Loading ...
Loading ...
Loading ...