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RAID10 3 drive failure

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October 3, 2013 8:22:00 PM

If a Raid 10 array of 4 drives.....had a failure of 3 of 4 of those drives...would the virtual disk still manage to continue on reading and writing new information to that single remaining drive. I do understand that it is not possible to rebuild it.

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a b G Storage
October 3, 2013 8:33:02 PM

No, its not possible to recover your data, because RAID 10 is actually RAID 1+0. That means that you have two sets of mirrored drives running in parallel. So if you have 4 drives (A1, A2, B1, B2) Then A1 and A2 have half of the data while B1 and B2 store the other half. If you lose two of the same mirrors (i.e. both a's or both b's) then you won't be able to recover. Losing 3 drives guarantees that you have two mirrors destroyed.
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October 3, 2013 8:46:49 PM

i know it cannot be recovered. But will the entire array continue to limp along writing and reading any new data to the single remaining drive? thanks
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a b G Storage
October 3, 2013 8:57:27 PM

eye_2_eye said:
i know it cannot be recovered. But will the entire array continue to limp along writing and reading any new data to the single remaining drive? thanks


You shouldn't be able to boot from a three drive failure.
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October 3, 2013 9:42:08 PM

i would agree with that as well....old data is lost. The reason I am asking is that today we had 2 drives down in our array of 4....then the unthinkable happened where when they went to replace a drive they pulled the wrong drive. 3 drives out!. but interestingly the server seemed to carry on...?? Old data was inaccessible.
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a b G Storage
October 4, 2013 4:37:04 PM

Did you have a separate drive with the OS running on it? Most servers with more than one drive will separate the OS and have it on a separate HHD. It could be located in a different area (e.g. if your RAID 10 drives were in hot swap slots).
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