Dear all, unfortunately, I am very very deperate and I highly appreciate any help. One week ago, I move my entire system to btrfs to setup a RAID1. I created the RAID between device /dev/sdb and /dev/sdc with no partition table on normal HDDs. Everything was working smoothly until my computer crashed and at reboot I was not able to mount the device (my home dir) again and got the following messages: [ 125.834802] BTRFS info (device sdc): disk space caching is enabled [ 130.600101] BTRFS error (device sdc): block group 1268688879616 has wrong amount of free space [ 130.600113] BTRFS error (device sdc): failed to load free space cache for block group 1268688879616 [ 130.751274] BTRFS critical (device sdc): corrupt leaf, slot offset bad: block=1268477591552,root=1, slot=137 [ 130.751659] BTRFS critical (device sdc): corrupt leaf, slot offset bad: block=1268477591552,root=1, slot=137 So I cleared the cache with trying the mount option clear_cache, but it stayed problematic and I was not able to mount it: [ 368.159594] BTRFS: error (device sdc) in __btrfs_free_extent:5755: errno=-5 IO failure [ 368.159602] BTRFS: error (device sdc) in btrfs_run_delayed_refs:2713: errno=-5 IO failure [ 368.165584] BTRFS warning (device sdc): Skipping commit of aborted transaction. [ 368.165589] BTRFS: error (device sdc) in cleanup_transaction:1545: errno=-5 IO failure [ 368.165787] BTRFS: error (device sdc) in open_ctree:2839: errno=-5 IO failure (Failed to recover log tree) [ 368.227161] BTRFS: open_ctree failed Now, if I tried to mount it manually with degraded option enabled: # mount -t btrfs -o degraded /dev/sdb /mnt/sonst/ mount: wrong fs type, bad option, bad superblock on /dev/sdb, missing codepage or helper program, or other error In some cases useful info is found in syslog - try dmesg | tail or so. Now I run btrfsck with repair option enabled but still I cannot mount it. Here you can find the dmesg and btrfsck outputs: dmesg: http://pastebin.com/zsaKQ0h1 btrfsck: http://pastebin.com/xva6uJwT Please, help me! ;( Are there other options to investigate my RAID or to even temporarily mount it to get some data? What went wrong here? What can I do? Why is a simple crash making my RAID unusable? Can I use other tools for a recovery? Again, every help is highly appreciated. Best wishes, Max PS: Archlinux, linux-3.14-5, btrfs-progs-3.14-1