2
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
Array
Advantages
Drawbacks
#Hard Disks Fault Tolerance
RAID0
RAID1
RAID0+1
JBOD
High data throughput
No fault tolerance
multiple
No
100% data
redundancy
Requires two
drives for the storage
space of one drive
2
Yes
4+
Yes
multiple
No
Optimized for both
100%data redundancy
and performance.
Allows spare disks.
ombines and uses
the capacity of odd
size drives.
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.
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