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btrfs_merge_bio_hook+a0 error, recovery possible?
Hi,
I have a ReadyNAS 204 with the btrfs_merge_bio_hook+a0 error. After reboot I can ssh into the box, but the web interface does not load and the data volume is not mounted.
Output of cat /proc/mdstat:
md127 : active raid5 sda3[0] sdd3[3] sdc3[2] sdb3[1]
11706506496 blocks super 1.2 level 5, 64k chunk, algorithm 2 [4/4] [UUUU]
md1 : active raid6 sda2[0] sdd2[3] sdc2[2] sdb2[1]
1047424 blocks super 1.2 level 6, 64k chunk, algorithm 2 [4/4] [UUUU]
md0 : active raid1 sda1[0] sdd1[3] sdc1[2] sdb1[1]
4190208 blocks super 1.2 [4/4] [UUUU]
unused devices: <none>Output of btrfs fi show:
Label: '1165568a:Volume1' uuid: 56990628-d1ea-4142-8c3d-5dd32b620f00
Total devices 1 FS bytes used 8.30TiB
devid 1 size 10.90TiB used 8.35TiB path /dev/md127
btrfs-progs v4.1.2It is possible that volume allocation has exceeded 85%. Didn't know it can cause errors. Is there a chance of recovering the volume or is facory reset my only option?
Eventually I used --path-regex to restore specific directories and it worked fine. Seems that everything I wanted was copied.
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Hello edkedk,
What's the model number and FW version?
Welcome to the community!
Regards,
Can you try booting your NAS into volume read-only mode (a boot menu option) and see if the data is then accessible?
HI,
Model no. is RN204, fw version 6.4.2
Booting into read-only mode results in btrfs_merge_bio_hook+a0 being displayed and the data volume not mounted.
If I move the disks to a PC running Linux, will I be able to mount the volume?
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