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        Evertop RAID Storage Recovery Services...!

Lost Your importanat Data...? We can help.

Evertop Computers specialises in recovering data from RAID failures

There are three general reasons for a RAID failure.
    Failure of one of the RAID member disks;
    Failure of several RAID member disks;
    Other RAID failures not associated with the member disks

RAID 5 failures

RAID 5 can fail due to any of the mentioned above reasons. However, RAID 5 is a redudant array which means it can survive failure of one of the member disk. If failure of your RAID 5 affects only one member disk then you are lucky and can easily get your data back. In case of multiple disk failures there is zero chance of recovering the array data.

Failure of one of the RAID 5 member disks

  For a NAS, the LED corresponding to the damaged disk turns red;
  Drivers or RAID 5 controlling software produce the message that the disk has failed.

Failure of several RAID 5 member disks

  For a NAS, the LEDs corresponding to the failed disks turn red.
  The array is not accessible; however, it seems that controller works properly.

Since RAID 5 is capable to survive single member disk failure only, then for multiple disk failures it is impossible to recover data that was on the failed disks. However, you can try to recover data which is contained on the remaining disks. Files can be restored in the following cases:

  A file is located on a good disk and a file size is less than a block size.
  A file occupies several consequent blocks located on the good disks.

Other RAID 5 failures not associated with the member disks

Such RAID 5 failures include operator errors, controller failures, or RAID 5 controlling software failures. In this case RAID 5 configuration metadata is lost, but the member disks are working properly. With these failures, it is possible to recover data from RAID 5. First, you should determine the array configuration parameters and then recover data from the array using any data recovery software.

RAID 5 configuration includes:
  number of member disks,
  disk order, along with what disk was the first in the array,
  block size,
  start offset on the disks,
  parity position and rotation.

RAID 1E failures

Although RAID 1E is not a typical array layout, it is subject to the same types of failure as more common arrays are, such as member disk failures or an operator error. But not all the RAID 1E failures lead to data loss, for example in case of a single disk failure you just need to replace the disk and rebuild the array. RAID 1E can even survive a multiple disk failure given that the failed disks were nonadjacent. For more information about RAID1E layout.

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