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Almost all SME, (Small to Medium Enterprises), have turned to RAID-configured storage on their servers in recent years for their mission-critical applications and data. In spite of being considered highly fault-tolerant, RAID does fail. RAID can fail due to component failure (including hard drives and controller cards), operating and application corruption, but most commonly, simple user error, often leaving the data unusable and corrupted.
RAID's are amongst the most complex media devices to recover data from. The data configurations are quite complex such as striped, volume, spanned etc. Sadly, different manufacturers will often use bespoke configuration applications that can add further complexity.
While state-of-the-art recovery tools and techniques are essential, ultimately it is the experience of both the recovery engineers and the software coders that makes the difference between a successful recovery and a failure. Successful RAID recovery often depends on an extremely fine-tuned sense of pattern recognition that is developed over years and years of recovering data from complex RAID configurations.
Disklabs Data Recovery and Computer Forensic Services is part of the 1 st Computer Traders Ltd group, which encompasses a company that repairs and sells hard disk drives, a company that specialises in surplus and end of line computer equipment, and of course a Data Recovery and Computer Forensics Services company.
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The
data block is subdivided ('striped') and written on the data disks. Stripe
parity is generated on Writes, recorded on the parity disk and checked on
Reads.
RAID Level 3 requires a minimum of 3 drives to implement
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 Advantages
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 Disadvantages
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Very
high Read data transfer rate
Very high Write data transfer rate
Disk failure has an insignificant impact on throughput
Low ratio of ECC (Parity) disks to data disks means high efficiency
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Transaction
rate equal to that of a single disk drive at best (if spindles are
synchronized)
Controller design is fairly complex
Very difficult and resource intensive to do as a 'software' RAID
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Thanks to AC&NC for their technical input into this page.
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