November 25, 20169 yr So at some point I had a weird ssd failure and lost a drive in the pool; I swapped it for another but now I am getting crc errors reading from some files on the pool. I have a good backup of the files on the pool and simply want to destroy the whole pool and start from scratch. How do I do this? I tried setting the cache drive number to zero after removing all devices but it still thinks it should have all the drives that used to be in the pool once I start rebuilding it... I assume there is a command line command I need to execute to completely destroy the btrfs config; but for the life of me cannot find it. anyone know how to do this?
November 26, 20169 yr You could use the command line, but to do it just using the GUI, set the cache to a single slot, and then change the format type to xfs. Start the array, and it should say your single cache drive is unformatted. Select the checkbox and format it. Stop the array, assign the next victim to the single cache slot, start the array, and format it to xfs. Repeat until all desired cache devices are xfs. Change the cache slots to reflect the number of devices you want to use, assign them all, and start the array. It will say unformatted, and this time when you select format, it will automatically be set to btrfs, and should format all devices to RAID1 like you want. BE VERY CAREFUL WHEN YOU SELECT FORMAT. IF ONE OF YOUR ARRAY DISKS SAYS UNMOUNTABLE INSTEAD OF JUST YOUR CACHE DRIVE, STOP, AND POST BACK WITH YOUR DIAGNOSTICS. Unraid will format ALL unmountable drives when you select that option, not just the one you intended, so if for some reason more drives than just the cache show unmountable, it will format them all.
November 26, 20169 yr Author Worked like a champ, thanks for the detailed write up... Might should add that to the wiki / knowledgebase. I think this time i'm going to stick with raid1 instead of raid10 across my 4 ssd's..
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