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RAID Basics
A Redundant Array of Independent Disks is an array, or group, of multiple independent physical drives
that provide high performance and fault tolerance. A RAID drive group improves I/O performance and
reliability. The RAID drive group appears to the host computer as a single storage volume or as multiple
virtual units. An I/O transaction is expedited because several drives can be accessed simultaneously.
A RAID drive group improves data storage reliability and fault tolerance compared to single drive
storage. Data loss resulting from a drive failure can be prevented by reconstructing missing data from
the remaining drives. The benets of RAID come from the improvement of I/O performance and the
increased reliability.
What are the Virtual drives?
Virtual drives are drive groups that are available to the operating systems. The storage space in a
virrtual drive comes from all the members in the drive group.
The RAID functions available for virtual drives include:
Hot spare drives.
Drive group and virtual drive congurations.
Initializing one or more virtual drives.
Individual access to controllers, virtual drives, and disk drives.
Failed drive rebuild.
Verication of redundancy data in virtual drives using RAID levels 1, 5, 6, 10, 50, and 60.
Reconstructing virtual drives after the RAID levels or adding a drive to a drive group.
Indepently selecting a host controller to work for.
For a RAID volume conguration, it is recommended you use hard drives of the same model featuring
the same capacity and rotation speed. It is also preferred that these drives are running the same
version of rmware.
IMPORTANT:
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