March 20, 20242 yr Community Expert I have two 960GB SSDs assigned as one Cache Pool - BTRFS - Single Mode I wanted to remove one to be a separate Cache pool so I've stopped the array and unassigned the drive then started the array so the rebalance operation happens .. but instead I got unmountable: unsupported or no file system message on the remaining drive .. stopped the array again and put the drive back and now both giving the same message Tired these solutions and checks and nothing worked : remove them all then add them reboot btrfs check --force -s 1 /dev/sdc using SB copy 1, bytenr 67108864 Opening filesystem to check... No valid Btrfs found on /dev/sdc ERROR: cannot open file system btrfs check /dev/sdc Opening filesystem to check... No valid Btrfs found on /dev/sdc ERROR: cannot open file system btrfs rescue super-recover -v /dev/sdc No valid Btrfs found on /dev/sdc Usage or syntax errors mount -o rescue=all,ro /dev/sdc /temp mount: /temp: wrong fs type, bad option, bad superblock on /dev/sdc, missing codepage or helper program, or other error. dmesg(1) may have more information after failed mount system call. mount -o degraded,rescue=all,ro /dev/sdc /temp mount: /temp: wrong fs type, bad option, bad superblock on /dev/sdc, missing codepage or helper program, or other error. btrfs restore -v /dev/sdc /mnt/disk2/restore No valid Btrfs found on /dev/sdc Could not open root, trying backup super No valid Btrfs found on /dev/sdc Could not open root, trying backup super No valid Btrfs found on /dev/sdc Could not open root, trying backup super I've tried all the commands above also with the second drive (sdb) fdisk -l /dev/sdc \Disk /dev/sdc: 894.25 GiB, 960197124096 bytes, 1875385008 sectors Disk model: KINGSTON SA400S3 Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes fdisk -l /dev/sdb Disk /dev/sdb: 894.25 GiB, 960197124096 bytes, 1875385008 sectors Disk model: KINGSTON SA400S3 Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Screenshoot & diagnostics attached. Note : don't worry about the second drive SATA CRC error count that's because of a faultily SATA cable and now fixed. also the second drive is 24hrs old BTW. so it's new and working before removing it. warmind-diagnostics-20240320-0553.zip Edited March 20, 20242 yr by Thamer Alfuraiji more info
March 20, 20242 yr Author Community Expert Solution Updated : I've fixed it .. by following this solution in this thread it seems that I lost the partitions and this retrieved them back ! Thanks to @JorgeB !!!!
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