Vivotek NR9682-v2 64-Channel NVR (No HDD) - Manual (Page 45)

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User's Manual - 45
Level Description
00 Configure 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 Configure 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 configuration, the hot
spare will be used first on the backplane side in which it resides.If the hot spare is designated as
having enclosure affinity, 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
Global Hot Spare
Use a global hot spare drive to replace any failed drive in a redundant drive group as long as
its capacity is equal to or larger than the coerced capacity of the failed drive. A global hot spare
defined on any channel should be available to replace a failed drive on both channels.
Dedicated Hot Spare
Use a dedicated hot spare to replace a failed drive only in a selected drive group. One or more
drives can be designated as a member of a spare drive pool. The most suitable drive from the
pool is selected for failover. A dedicated hot spare is used before one from the global hot spare
pool.