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or does not respond ,the remaining drive will continue to function. Due to

redundancy, the drive capacity of the array is the capacity of the smallest drive.

Under a RAID 1 setup, an extra drive called the spare drive can be attached .

Such a drive will be activated to replace a failed drive that is part of a mirrored

array.Due to the fault tolerance,if any RAID1 drive fails ,data access will not

be affected as long as there are other working drivings in the array.

RAID 10 (0+1)

RAID 10 is a combination of striping and mirroring. This configuration provides

optimal speed and reliability, but you need four SATA hard disks.

JBOD(Spanniing)

A spanning disk array is equal to the sum of the all drives when the drives

used are having different capacities.Spanning stores data onto a drive until it

is full, then proceeds to store files onto the next drive in the array. When any

disk member fails, the failure affects the entire array. JBOD is not really a

RAID and does not support fault tolerance.

Summary of Raid Configrations

Advantages

Array

RAID0

High data throughput

100% data

RAID1

redundancy

Optimized for both

100%data redundancy

RAID0+1

and performance.

Allows spare disks.

ombines and uses

the capacity of odd

size drives.

JBOD

#Hard Disks Fault Tolerance

Drawbacks

multiple

No fault tolerance

Requires two

drives for the storage

space of one drive

Requires two drives

for the storage space

of one drive -the same

as RAID level 1

Decreases perfor-

mance because of the

difficulty in using drives

concurrently or to

optimize drives for

different uses.

Yes

multiple