qnology Posted July 17, 2021 Share Posted July 17, 2021 My USB Drive failed. It is no longer recognized. I do not have a backup. I have a new USB Drive and reinstalled UNRAID. I have 6 drives. One parity drive and one cache drive. I'm not 100% certain which one is the parity drive and the warning message that states the parity drive will be wiped makes me a little nervous. I have a diagnostic file ready. Any help is appreciated. Quote Link to comment
JorgeB Posted July 17, 2021 Share Posted July 17, 2021 Install the UD plugin and mount all the disks read-only, there should only be one disk that doesn't mount, that would be parity, if yes assign all the disks, data disk order doesn't matter with single parity, check "parity is already valid" and start the array. Quote Link to comment
itimpi Posted July 17, 2021 Share Posted July 17, 2021 A procedure you can use is documented here in the online documentation that can be accessed via the Manual link at the bottom of the Unraid GUI. Quote Link to comment
JorgeB Posted July 17, 2021 Share Posted July 17, 2021 2 minutes ago, itimpi said: A procedure you can use is documented here That will make parity out of sync, maybe using UD and mounting the disks read-only could be added as an option. Quote Link to comment
itimpi Posted July 17, 2021 Share Posted July 17, 2021 5 minutes ago, JorgeB said: That will make parity out of sync, maybe using UD and mounting the disks read-only could be added as an option. It is already mentioned, but maybe the emphasis needs to be changed with the UD approach given in more detail and it made the first one listed? Quote Link to comment
JorgeB Posted July 17, 2021 Share Posted July 17, 2021 51 minutes ago, itimpi said: It is already mentioned, but maybe the emphasis needs to be changed with the UD approach given in more detail and it made the first one listed? Didn't noticed, but yeah, IMHO it should men mentioned first as a way to keep parity 100% in sync, just in case a disk fails before it can be corrected if doing the other way. Quote Link to comment
itimpi Posted July 17, 2021 Share Posted July 17, 2021 35 minutes ago, JorgeB said: Didn't noticed, but yeah, IMHO it should men mentioned first as a way to keep parity 100% in sync, just in case a disk fails before it can be corrected if doing the other way. I have now reworked that entry. Any suggestions for improvement or something that needs correcting? Quote Link to comment
JorgeB Posted July 17, 2021 Share Posted July 17, 2021 58 minutes ago, itimpi said: I have now reworked that entry. Looks good, I would just add that when using the second option user should run a correcting parity check ASAP to correct the sync errors. Quote Link to comment
itimpi Posted July 17, 2021 Share Posted July 17, 2021 3 hours ago, JorgeB said: Looks good, I would just add that when using the second option user should run a correcting parity check ASAP to correct the sync errors. will do 1 Quote Link to comment
qnology Posted July 18, 2021 Author Share Posted July 18, 2021 Thanks for everyone's help. I read on the forum the easiest way to identify the parity drive is to add all drives to the array (and none as parity), the drive that isn't formatted is the parity drive. Was able to recreate my array including my cache drive. Surprised that all my docker came back with no issues. Going forward, I guess I need to backup my USB drive every once in a while. Quote Link to comment
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