Biostar N4SLI-A9 Bedienungshandbuch PDF herunterladen (Seite 31)

N4SLI-A9

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 for m 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.

- 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.

Performance is impaired during drive rebuilds.

- Fault Tolerance: Yes.

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,

the same as RAID level 1.

- Fault Tolerance: Yes.

Blo ck 1

Block 2

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Blo ck 1

Block 2

Block 3

Block 2

Block 4

Block 6

Bl ock 1

Block 3

Block 5

Block 2

Block 4

Block 6

Block 1

Bl ock 3

Bl ock 5

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