Biostar N4SLI-A9 User Manual page 32

RAID 1:
Every read and write is actually carried out in parallel across 2 disk drives in a
RAID 1 array system. The mirrored (backup) copy of the data can reside on
the same disk or on a second
redundant drive in the array. RAID
1 provides a hot-standby copy of
data if the active volume or drive is
corrupted or becomes unavailable
because of a hardware failure.
RAID techniques can be applied
for high-availability solutions, or as
a form of automatic backup that
eliminates tedious manual backups
to more expensive and less reliable
media.
Features and Benefits
Drives: Minimum 2, and maximum is 2.
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Uses: RAID 1 is ideal for small databases or any other application that
-
requires fault tolerance and minimal capacity.
Benefits: Provides 100% data redundancy. Should one drive fail, the
-
controller switches to the other drive.
Drawbacks: Requires 2 drives for the storage space of one drive.
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Performance is impaired during drive rebuilds.
Fault Tolerance: Yes.
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RAID 0+1:
RAID 0 drives can be mirrored
suing RAID 1 techniques.
Resulting in a RAID 0+1
solution for improved
performance plus resiliency.
Features and Benefits
Drives: Minimum 4, and maximum is 6 or 8, depending on the platform.
-
Benefits: Optimizes for both fault tolerance and performance, allowing
-
for automatic redundancy. May be simultaneously used with other RAID
levels in an array, and allows for spare disks.
Drawbacks: Requires twice the available disk space for data redundancy,
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the same as RAID level 1.
Fault Tolerance: Yes.
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N4SLI-A9
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