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Anyway to recover data from a failed RAID5 array?

post #1 of 6
Thread Starter 
Title says it all, is it possible to even do it? Under a few different scenarios


1. RAID controller it was attached to failed but the drives are ok
2. 2 of the 3 drives failed and are no longer recognized by windows
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post #2 of 6
If I can remember right, Raid 5 allows for only 1 drive failiure...I'm not sure if all the data is written on each drive which is why recovery may cause a problem here. This isn't a very useful post, but good luck with your recovery.
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post #3 of 6
If a separate RAID controller card is what failed on you...you'll most likely require the same exact controller (preferably with the same version/model number) to be able to access your RAID array(s) ever again. This is easily solved by purchasing a duplicate controller in the first place. Otherwise you're likely at a loss.

However, losing your array (either losing more than 1 drive in a RAID-5 or losing more than 2 drives in a RAID-6) is most likely a full loss unless the failed drive(s) is(are) physically repaired. Reason being that the data is in a parity setup (split between the drives). To the point...a file that loses enough parts becomes inaccessible/unreadable. Same scenario solution...if you have extra drives prepared on hand for any failure then you would swap them right away and rebuild. However, having simultaneous drives fail on you or having additional drives fail on you during a rebuild will put you at a loss as well.

This is why RAID setups are a downtime reducing solution...not a substitute for backing up your data.

"Data does not exist unless it exist in three places at once."
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post #4 of 6
Thread Starter 
Quote:
Originally Posted by pvp309rcp View Post

If a separate RAID controller card is what failed on you...you'll most likely require the same exact controller (preferably with the same version/model number) to be able to access your RAID array(s) ever again. This is easily solved by purchasing a duplicate controller in the first place. Otherwise you're likely at a loss.
However, losing your array (either losing more than 1 drive in a RAID-5 or losing more than 2 drives in a RAID-6) is most likely a full loss unless the failed drive(s) is(are) physically repaired. Reason being that the data is in a parity setup (split between the drives). To the point...a file that loses enough parts becomes inaccessible/unreadable. Same scenario solution...if you have extra drives prepared on hand for any failure then you would swap them right away and rebuild. However, having simultaneous drives fail on you or having additional drives fail on you during a rebuild will put you at a loss as well.
This is why RAID setups are a downtime reducing solution...not a substitute for backing up your data.
"Data does not exist unless it exist in three places at once."

Oh trust me i know RAID isnt a subsitute for a proper backup, this was someone else. Thanks for the reply thumb.gif
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post #5 of 6
What raid controller? If it is motherboard/software raid, you are screwed. If its hardware based controller, you can import foreign and do a retag if that fails.
post #6 of 6
Thread Starter 
Quote:
Originally Posted by kyle5281 View Post

What raid controller? If it is motherboard/software raid, you are screwed. If its hardware based controller, you can import foreign and do a retag if that fails.

it was more of a theoretical question tbh
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