RAID Levels
The Disk array controllers monitored
by this utility for RAID Advisory
Board-approved(RAID 0, RAID 1, RAID 3,
RAID 5 and RAID 0+1). These are
supported by the DAC960 controllers.

The appropriate RAID level for a system
is selected by the system manager or
integrator. this decision will be
based on which of the following will
be emphasized.

Disk Capacity

Data Availablility
(redundant or fault tolerance)


Disk Performace


RAID Levels

Level 0: Block,"stripping" across
multiple drives is provided, yielding
higher performance than is possible
with individual drives. This level
does not provide any redundancy.

Level 1: Drives are paired and mirrored.
All data is 100 precent duplicated on
a drive of equivalent size.

Level 3: Data is "striped" across several
physical drives.Maintains parity
information which can be used for data
recovery.

Level 5: Data is "striped" across serveral
physical drives. For data redundancy,
drives are encoded with rotated parity.

Level 0+1: Combines RAID 0 striping and
RAID 1 mirroring.This level provides
redundancy though mirroring. (aka. Mylex
RAID 6) 
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