How to Recover Data from Raid 5 Disk Failure?

RAID 5 is the most commonly used RAID configuration in businesses as it offers performance equivalent to RAID 0, and provides more available storage as compared to RAID 1 and RAID 10. It provides fault tolerance of up to 1 disk failure. In case a disk fails, RAID 5 uses parity information which is distributed throughout all the member disks. Therefore, data can be retrieved from other disks in the array. However, failure of multiple disks in RAID 5 array results in data loss.

What Happens When a Disk Fails in RAID 5?

Raid Recovery

Failure of single disk on RAID 5 disk array changes the status of disk array to Degraded.

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When single disk in a RAID 5 disk array fails, the mode of operation of disk array changes from Optimal or OK to Degraded. In Degraded mode, RAID typically continues to function, but with poor performance.

[NOTE]: You may also encounter some error messages after single disk failure in RAID 5. If you’re unable to fix the errors or unable to access the data, consult a Professional Data Recovery Service provider.

Would I lose data on RAID 5 if one of the disks have failed? You don’t lose data on failure of 1 disk in RAID 5 array. Parity data available on other member disks allow users to access the data stored on failed disk. However, this results in a slower RAID 5 performance. If the failed disk is not replaced, it might lead to the failure of other drive(s).

 [ATTENTION]: You must immediately rebuild the failed disk data on another disk as failure of second or more member disk(s) would result in data loss.

Most of the RAID controllers automatically rebuild data on hot spare drives, which act as standby drives. If hot spare is not available, you can replace the failed disk with a working disk, and initiate a rebuild to bring your RAID 5 array back to optimal mode and prevent data loss.

NOTE: If there’s a failure of two or more disks, the RAID 5 would fail and you’d lose access to the data stored on it.

How to Recover Data from RAID 5 with 2 or more Failed Drives?

As discussed, failure of 2 or more disks results in the failure of RAID 5 array. To recover data in such a case:

  • You need to bring the failed disks into normal working condition
  • You need to extract the original logical parameters of RAID array from the disks

These tasks can be carried out only by technical experts on RAID. Therefore, you must seek the help of a professional RAID data recovery service provider like Stellar, which has a team of experts that are well versed with RAID technology and data recovery from RAID. With the help of advanced tools and techniques, they first analyze the failed drives, and then recover the data even if the drives are physically damaged. Stellar’s RAID recovery service assures up to 100% recovery of your crucial business data with integrity and privacy.

[BONUS]: Prevent Permanent Data Loss from RAID 5 after Disk Failure

If you’ve lost data from RAID 5 due to failure of multiple disks, follow the below given tips so that you don’t lose your crucial data beyond the scope of recovery:

  • Don’t try to repair a physically failed RAID disk on your own
  • Don’t reconfigure the RAID partition as it may overwrite the data on disks
  • Don’t try to rebuild RAID as you might not know the correct logical parameters
  • Avoid hit and trial methods to fix RAID failure or errors
  • Keep the disks labelled
  • To get RAID data, contact RAID recovery experts such as Stellar

Conclusion

If a RAID 5 disk fails, make sure that it’s replaced with another disk of same or higher capacity. Also, ensure that the data from failed disk is rebuilt on the newly introduced disk.

When 2 or more disks fail in a RAID 5 array, you lose all the data/files. To recover data in such situation, contact a RAID data recovery expert. The data recovery expert like Stellar has all the required tools and equipment to recover almost 100% data from RAID disks.

Stellar is an ISO 27001 & ISO 9001 certified organization and provides 100% safe and secure data recovery services and maintains a high level of data confidentiality. They have 15 branches across India and recovering data since 1993. Stellar, have served more than 3+ Million customers worldwide and the services available for both corporates and individuals for all kind of data loss situations. For more information about stellar data recovery visit their official website.

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