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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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RAID
Level 0+1 requires a minimum of 4 drives to implement
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 Advantages
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 Disadvantages
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RAID
0+1 is implemented as a mirrored array whose segments are RAID 0 arrays
RAID 0+1 has the same fault tolerance as RAID level 5
RAID 0+1 has the same overhead for fault-tolerance as mirroring alone
Excellent solution for sites that need high performance but are not concerned
with achieving maximum reliability
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RAID
0+1 is NOT to be confused with RAID 10. A single drive failure will cause the
whole array to become, in essence, a RAID Level 0 array
Very expensive / High overhead
Very limited scalability at a very high inherent cost
All drives must move in parallel to proper track lowering sustained
performance
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Thanks to AC&NC for their technical input into this page.
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