Vivotek NR9682-v2 64-Channel NVR (No HDD) - Manual (Page 40)

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40 - User's Manual
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 benefits 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 configurations.
 Initializing one or more virtual drives.
 Individual access to controllers, virtual drives, and disk drives.
 Failed drive rebuild.
 Verification 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.
RAID configuration components
 Drive group: a group of physical drives. These drives will be managed in partitions known as
virtual drives.
 Virtual drive: a partition in a drive group made of continguous data segments from the
individual disk drives. A virtual drive can consist of the following components:
 An entire drive group.
 More than one entire drive group.
 A part of drive group.
 Parts of more than one drive group.
 A combination of any two of the conditions above.
For a RAID volume configuration, 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 firmware.
IMPORTANT: