Recovering from disk failure (RAID5)

Hi,

I have a BTRFS setup with 8 HDD stripped with RAID5. I know it’s mark as experimental, as it has problem with power failures. I decided to give it a shot. Last night one of the disks in the array failed, the OS decided to remount the FS into read-only mode. The data was still accessible. I started backing things up, but few hours later I started getting I/O errors.

Currently I’m stuck at this: http://pastebin.com/n9cGVqJB

With dmesg giving me this: http://pastebin.com/F5626BAc while trying to mount the FS (even with –o degraded)

Kernel version: 4.4.0-42-generic
Btrfs progs version: v4.7.2
Btrfs fi show: http://pastebin.com/X7Hpw2tb
btrfs fi df: currently the file system is not mountable

--
Komu