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RAID 6 Data Recovery

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Recovering data from offline and damaged RAID servers and arrays

Recovering data from RAID 6 servers & arrays

>> (for RAID 5 repair and data recovery click here)

Data Clinic offer a prompt and professional service for the successful recovery of your valuable data from any type of failed RAID system including Dell PowerEdge / PowerVault, HP, XServe and SuperMicro systems. In addition to a free collection service that ships your damaged RAID to us, we offer a UK call out service where we repair your RAID & recover your critical data onsite.

We believe our RAID recovery & repair capabilities to be the finest in the country and have recovered many RAIDs that other data recovery companies could not. If your RAID data is valuable please speak to us !!!

Specific failures on RAID systems that we can recover data from include:

  • RAID array / Controller Card Failure
  • Controller Card Set-up Corruption
  • RAID Container Crash
  • Server won't boot
  • Server registry configuration lost
  • Rebuild failure
  • Damaged striping
  • Multiple hard disk drive failure (or multiple drives go offline)
  • Intermittent drive failure resulting in configuration corruption
  • RAID array or volumes that won't mount after a server crash
  • Configuration damage or corruption
  • Addition of incompatible drives
  • Hardware conflicts
  • Software corruption
  • Software or operating system upgrades

RAID 6 Testimonial

"That's great - Yes!"

Sandvik Ltd, 2008
(6 disk RAID 6) Data Recovered

 

Above: Typical data layout across a RAID 6 server array.

Data is distributed across all disks in the array. Due to the data redundancy of RAID 6, up to 2 disks can fail simultaneously before any data loss takes place.


Techy Stuff
There are two distinct types of RAID 6 architecture: RAID6 P+Q and RAID6 DP.

DP, or Double Parity raid uses a mathematical method to generate two independent parity bits for each block of data, and several mathematical methods are used. P+Q generates a horizontal P parity block, then combines those disks into a second vertical RAID stripe and generates a Q parity, hence P+Q. One way to visualise this is to picture three standard four disk RAID5 arrays then take a fourth array and stripe again to construct a second set of raid arrays that consist of one disk from each of the first three arrays, plus a fourth disk from the fourth array. The consequence is that those sixteen disks will only contain nine disks worth of data.

P+Q architectures tend to perform better than DP architectures and are more flexible in the number of disks that can be in each RAID array. DP architectures usually insist that the number of disks is prime, something like 4+1, 6+1 or 10+1. This can be a problem as the physical disks usually come in units of eight, and so do not easily fit a prime number scheme.

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