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 Post subject: RAID 6 with 2 drives missing
PostPosted: February 22nd, 2018, 12:05 
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Joined: February 9th, 2009, 16:13
Posts: 2071
Location: Ontario, Canada
I've got a case here now with 12 x 4TB SAS drives in a RAID-6 with a 3 drive failure from a Dell Perc RAID controller.

R-Explorer - setup with 2 missing drives, with the known order and BS, using the default RAID 6 config, data is immediately accessible

R-Studio - setup with 2 missing drives, with the know order, BS and RAID config, data is not accessible. The only way to get it to work is to include the clone of a stale drive and only have 1 missing disk. So, basically, it seems R-Studio only supports 1 missing disk for RAID 6

ReclaiMe PRO - this program won't even let you add 2 missing disks for a RAID 6 manual config. Just as R-Studio, it would appear that it only works with 1 missing disk in a RAID 6 recovery

Is this unique to my case or has anyone else also noticed this issue with these programs. At the very least, it is a huge feather in R-Explorer's hat.

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 Post subject: Re: RAID 6 with 2 drives missing
PostPosted: February 27th, 2018, 18:25 
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Joined: February 27th, 2018, 18:21
Posts: 5
Location: italy
you can use ups explorer raid recovery...is the best for auto reconstruct raid 6.


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 Post subject: Re: RAID 6 with 2 drives missing
PostPosted: February 27th, 2018, 23:57 
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Joined: February 17th, 2018, 18:32
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Location: Brazi
By the way, it's UFS and not ups. I recently used ReclaiMe standard to recover RAID 5 with only 3 drives and one drive missing from these 3 and it worked fine.


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 Post subject: Re: RAID 6 with 2 drives missing
PostPosted: February 28th, 2018, 0:19 
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Location: Ontario, Canada
1. UFS Explorer is just an old version of R-Exploere
2. There is a big difference between 1 drive missing from a RAID-5 and 2 drives missing from RAID-6

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 Post subject: Re: RAID 6 with 2 drives missing
PostPosted: February 28th, 2018, 5:13 
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Joined: May 13th, 2010, 11:17
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Location: Kuwait
@ lcoughey

PM sent.. :wink:

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 Post subject: Re: RAID 6 with 2 drives missing
PostPosted: February 28th, 2018, 10:56 
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Joined: February 9th, 2009, 16:13
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Location: Ontario, Canada
In a response from R-Studio support on their forum, they said that a RAID-6 mdadm software RAID works with 2 drives missing in their test case. So, I suppose it is possible that the issue with R-Studio might be limited to hardware RAID-6 configurations and possibly just larger arrays.

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 Post subject: Re: RAID 6 with 2 drives missing
PostPosted: March 22nd, 2018, 10:58 
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Joined: February 19th, 2011, 11:05
Posts: 256
Location: Toronto
We've found and fixed this bug in this new build of R-Studio.

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 Post subject: Re: RAID 6 with 2 drives missing
PostPosted: March 25th, 2018, 10:30 
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Joined: February 9th, 2009, 16:13
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Location: Ontario, Canada
I'm glad that it was a glitch and not just me being stupid...and also glad I was able to make it known so you could fix it.

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