Hello all.
I am having a problem with my btrfs cache drives on Unraid and I am hoping someone here can help me? I am very much in over my head.
I was adding a USB PCI card to my machine and must have loosened the SATA cable on one of my cache drives in the process, because when I restarted Unraid it said the drive was missing. So I powered down, resat the cable, and powered up. When I did so, the cache drive was listed, but as unmounted, not under the cache. I did some searching here and several posts said to just remount the drive, so I did that. Now with the Array started it says "Unmountable: No file system".
So, per the FAQ here I ran "mount -o degraded,usebackuproot,ro /dev/sdc1 /x", and it mounted (the first command listed didn't work). But if I look at the /x files it only shows the one cache drive having any files, not the other.
Have I lost all my data that had been on that other drive? I honestly can't remember if I had parity set up for the cache-- I did at one point, but the disks are two different sizes and it was causing problems, so I can't remember if I turned off the parity or if I fixed it some other way.
I am in the process of copying all the files from /x to a share on the array using the terminal command line. So far several files have had "input/output errors", but nothing I'll miss. Docker.img was one, but I know how to rebuild that. Are those the I/O errored files the only ones that are going to be lost, and the rest should be okay?
I'm just not sure what to look for before I reformat the cache drives after copying and want to lose as little as possible.
My diagnostics are attached.
mediiia-diagnostics-20210108-1359.zip