Greetings, Yesterday I had a drive failure (well...I broke the SATA power plug on the drive) in a 2x1TB disk btrfs RAID 1 array. I removed the failed drive, rebooted and mounted the array with '-o degraded'. I thought at first I could use the 'btrfs device delete missing' but then realized I actually had to _add_ a device first, even though the broken hard drive was already removed. I added an empty 2TB disk to the array (just to get the remaining 1TB drive mirrored again) and started a 'btrfs balance start /home'. It ran for several hours, then got a segfault (systemd journal: http://sprunge.us/RKeM. Segfault is at the end of the page). This morning I tried a 'btrfs balance cancel /home' and it's been stuck for over 12 hours now without cancelling. There's nothing in htop or glances that's obvious except the load average (i3 CPU) has been sitting at around 2.0 (normally .1-.3) since the attempted cancel. All the other services running on the server seem to be operating normally. Backups are up-to-date! I'm a little afraid to reboot for fear of borking the existing 1Tb drive, but I'm not sure what else to try at this point. Any ideas? Thanks! Scott uname -a: Linux homeserver 4.0.4-2-ARCH #1 SMP PREEMPT Fri May 22 03:05:23 UTC 2015 x86_64 GNU/Linux btrfs --version: btrfs-progs v4.0 btrfs fi show: Label: 'ROOT' uuid: 59046c5c-4b32-44dd-9e82-41a215e69bd3 Total devices 1 FS bytes used 1.63GiB devid 1 size 107.79GiB used 4.04GiB path /dev/sdc3 Label: 'DATA' uuid: 8d170909-3031-47d5-b07a-8f4743c8c70c Total devices 3 FS bytes used 820.28GiB devid 2 size 931.51GiB used 839.03GiB path /dev/sdb devid 3 size 1.82TiB used 239.00GiB path /dev/sda *** Some devices missing btrfs-progs v4.0 btrfs fi df /home: Data, RAID1: total=836.00GiB, used=818.77GiB System, RAID1: total=32.00MiB, used=176.00KiB Metadata, RAID1: total=3.00GiB, used=1.50GiB GlobalReserve, single: total=512.00MiB, used=0.00B dmesg.log is attached (or http://sprunge.us/RKeM for journalctl output)
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