Vivotek NR9581 - Page 49

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User's Manual - 49
Parity Type Description
Online The virtual drive operating condition is good. All congured drives are online.
Degraded The virtual drive operating condition is not optimal. One of the congured drives has
failed or is ofine.
Partial Degraded The operating condition in a RAID 6 virtual drive is not optimal. One of the congured
drives has failed or is ofine. A RAID 6 drive group can tolerate up to two drive failures.
Failed The virtual drive has failed.
Ofine The virtual drive is not available to the RAID controller.
Virtual Drive States
The virtual drive states are described in the following table.
Parity Type Virtual Drive State Beep Code
RAID 0 virtual drive loses a virtual drive Ofine 3 seconds on and 1 second off
RAID 1 virtual drive loses a mirror drive Degraded 1 second on and 1 second off
RAID 1 virtual drive loses both drives Ofine 3 seconds on and 1 second off
RAID 5 virtual drive loses one drive Degraded 1 second on and 1 second off
RAID 5 virtual drive loses two or more
drives
Ofine 3 seconds on and 1 second off
RAID 6 virtual drive loses one drive Partially degraded 1 second on and 1 second off
RAID 6 virtual drive loses two drives Degraded 1 second on and 1 second off
RAID 6 virtual drive loses more than two
drives
Ofine 3 seconds on and 1 second off
A hot spare completes the Rebuild
process and is brought into a drive group
B/A 1 second on and 3 seconds off
A copy back occurs after a Rebuild
operation completes
Optimal 1 second on and 3 seconds off
Beep Codes
An alarm sounds on the MegaRAID controller when a virtual drive changes from an optimal
state to another state, when a hot spare rebuilds, and for test purposes.
RAID Levels
The RAID controller supports RAID levels 0, 00, 1, 5, 6, 10, 50, and 60. The supported RAID
levels are summarized in the following section.
In addition, the RAID controller supports independent drives (congured as RAID 0 and RAID 00
drive groups) The following sections describe the RAID levels in detail.
Summary of RAID Levels
A RAID 0 drive group uses striping to provide high data throughput, especially for large les in
an environment that does not require fault tolerance.
A RAID 1 drive group uses mirroring so that data written to one drive is simultaneously written
to another drive. The RAID 1 drive group is good for small databases or other applications that
require small capacity but complete data redundancy.