Raid 0 Data Recovery Services Irvine California
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.
While the block size can technically be as small as a byte it is
almost always a multiple of the hard disk sector size of 512
bytes. This lets each drive seek independently when randomly
reading or writing data on the disk. If all the accessed sectors
are entirely on one disk then the apparent seek time would be
the same as a single disk. If the accessed sectors are spread
evenly among the disks then the apparent seek time would be
reduced by half for two disks, by two-thirds for three disks,
etc., assuming identical disks. For normal data access patterns
the apparent seek time of the array would be between these two
extremes. The transfer speed of the array will be the transfer
speed of all the disks added together.
RAID
0 is useful for setups such as large read-only NFS servers where
mounting many disks is time-consuming or impossible and
redundancy is irrelevant. Another use is where the number of
disks is limited by the operating system. In Microsoft Windows,
the number of drive letters for hard disk drives may be limited
to 24, so RAID 0 is a popular way to use more disks. It is also
a popular choice for gaming systems where performance is
desired, data integrity is not very important, but cost is a
consideration to most users. However, since data is shared
between drives without redundancy, hard drives cannot be swapped
out as all disks are dependent upon each other.
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