RAID
0 Data Recovery
Also known as
a striped set,
RAID 0 splits
data evenly across
two or more disks
with no parity
information for
redundancy. We
can recover data
from these striped
sets. Regardless
of the problem,
if you have suffered
a drive failure,
controller failure,
or file system
corruption, we
can recover data
from your RAID
0 array.
Many customers
are utilizing
this technology
and they don't
even realize it.
RAID 0 is commonly
used in 500GB+
external drives.
Some of the most
common of these
that we get in
are LaCie
Big Disk and
Maxtor
One Touch
drives. It should
be noted that
for any RAID 0
recovery to be
successful, ALL
drives must be
accessible. If
one drive has
physically failed,
then we must first
get that drive
funtional again
so that we can
image and destripe
the set. If we
cannot image all
of the drives
within the array
then data corruption
will be prevalent.
It is important
to note that RAID
0 was not one
of the original
RAID levels, and
is not redundant.
RAID 0 is normally
used to increase
performance, although
it can also be
used as a way
to create a small
number of large
virtual disks
out of a large
number of small
physical ones.
A RAID 0 can be
created with disks
of differing sizes,
but the storage
space added to
the array by each
disk is limited
to the size of
the smallest disk—for
example, if a
120 GB disk is
striped together
with a 100 GB
disk, the size
of the array will
be 200 GB. Although
RAID 0 was not
specified in the
original RAID
paper, an idealized
implementation
of RAID 0 would
split I/O operations
into equal-sized
blocks and spread
them evenly across
two disks. RAID
0 implementations
with more than
two disks are
also possible,
however the reliability
of a given RAID
0 set is equal
to the average
reliability of
each disk divided
by the number
of disks in the
set. That is,
reliability (as
measured by mean
time to failure
(MTTF) or mean
time between failures
(MTBF)) is roughly
inversely proportional
to the number
of members—so
a set of two disks
is roughly half
as reliable as
a single disk.
The reason for
this is that the
file system is
distributed across
all disks. When
a drive fails
the file system
cannot cope with
such a large loss
of data and coherency
since the data
is "striped" across
all drives.
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