Hi all,
two days ago my btrfs filesystem became quite slow and the logs showed a lot of I/O errors on one of the HDDs. I ordered a replacement drive and tried to remove the failing drive from the filesystem (btrfs device remove). That removal command did not finish but just sat there without any output. Today the new drive arrived. Device removal still had not finished, but the filesystem had entered read-only mode last night. I shut down the system to replace the defective drive. However, after the reboot I am no longer able to mount the filesystem at all or recover any data from it.:( ***** uname -a Linux phoenix 4.14.78-gentoo #1 SMP Mon Dec 3 09:25:24 CET 2018 x86_64 AMD Opteron(tm) Processor 6174 AuthenticAMD GNU/Linux ***** btrfs --version btrfs-progs v4.19 ***** btrfs fi show warning, device 8 is missing warning, device 8 is missing checksum verify failed on 71133554540544 found B52922D9 wanted C8FB97CF checksum verify failed on 71133554540544 found 9820D207 wanted 189B50C0 checksum verify failed on 71133554540544 found 9820D207 wanted 189B50C0 bad tree block 71133554540544, bytenr mismatch, want=71133554540544, have=7227596181724576485 ERROR: cannot read chunk root Label: none uuid: 108df6ea-2846-4a88-8a50-61aedeef92b4 Total devices 10 FS bytes used 14.71TiB devid 1 size 2.73TiB used 2.04TiB path /dev/sdg1 devid 2 size 2.73TiB used 2.04TiB path /dev/sdh1 devid 3 size 2.73TiB used 2.04TiB path /dev/sdj1 devid 4 size 2.73TiB used 2.04TiB path /dev/sdi1 devid 5 size 2.73TiB used 2.04TiB path /dev/sde1 devid 6 size 2.73TiB used 2.04TiB path /dev/sdf1 devid 7 size 2.73TiB used 2.04TiB path /dev/sda1 devid 9 size 2.73TiB used 2.04TiB path /dev/sdc1 devid 10 size 2.73TiB used 2.04TiB path /dev/sdd1 *** Some devices missing ***** dmesg (after attempting mount with -o degraded) ... [ 8904.358084] BTRFS info (device sda1): turning on discard [ 8904.358088] BTRFS info (device sda1): allowing degraded mounts [ 8904.358089] BTRFS info (device sda1): disk space caching is enabled [ 8904.358091] BTRFS info (device sda1): has skinny extents [ 8904.361743] BTRFS warning (device sda1): devid 8 uuid 0e8b4aff-6d64-4d31-a135-705421928f94 is missing [ 8905.705036] BTRFS info (device sda1): bdev (null) errs: wr 0, rd 14809, flush 0, corrupt 4, gen 0 [ 8905.705041] BTRFS info (device sda1): bdev /dev/sda1 errs: wr 0, rd 4, flush 0, corrupt 0, gen 0 [ 8905.705052] BTRFS info (device sda1): bdev /dev/sdf1 errs: wr 0, rd 10543, flush 0, corrupt 0, gen 0 [ 8905.705062] BTRFS info (device sda1): bdev /dev/sdc1 errs: wr 0, rd 8, flush 0, corrupt 0, gen 0 [ 8909.565118] BTRFS error (device sda1): bad tree block start 12170572967447269873 34958581399552 [ 8909.565978] BTRFS error (device sda1): bad tree block start 12170572967447269873 34958581399552 [ 8909.567462] BTRFS error (device sda1): bad tree block start 12170572967447269873 34958581399552 [ 8909.568439] BTRFS error (device sda1): bad tree block start 12170572967447269873 34958581399552 [ 8909.569861] BTRFS error (device sda1): bad tree block start 12170572967447269873 34958581399552 [ 8909.570695] BTRFS error (device sda1): bad tree block start 12170572967447269873 34958581399552 [ 8909.572146] BTRFS error (device sda1): bad tree block start 12170572967447269873 34958581399552 [ 8909.572969] BTRFS error (device sda1): bad tree block start 12170572967447269873 34958581399552 [ 8909.574175] BTRFS error (device sda1): bad tree block start 12170572967447269873 34958581399552 [ 8909.574189] BTRFS error (device sda1): failed to read block groups: -5 [ 8909.635991] BTRFS error (device sda1): open_ctree failed ***** btrfs check /dev/sda1 Opening filesystem to check... warning, device 8 is missing warning, device 8 is missing checksum verify failed on 71133554540544 found B52922D9 wanted C8FB97CF checksum verify failed on 71133554540544 found 9820D207 wanted 189B50C0 checksum verify failed on 71133554540544 found 9820D207 wanted 189B50C0 bad tree block 71133554540544, bytenr mismatch, want=71133554540544, have=7227596181724576485 ERROR: cannot read chunk root ERROR: cannot open file system ***** I have tried all the mount / restore options listed here: https://forums.unraid.net/topic/46802-faq-for-unraid-v6/page/2/?tab=comments#comment-543490 ... and all I keep getting is "bad tree block" errors. Superblocks seem fine (btrfs rescue super-reecover found no problem). I am considering trying "btrfs rescue chunk-recover" at this point. Could this help in my situation? What do you think? Kind regards Edmund -- *Liland IT GmbH* Ferlach ● Wien ● München Tel: +43 463 220111 Tel: +49 89 458 15 940 off...@liland.com https://Liland.com <https://Liland.com> Copyright © 2019 Liland IT GmbH Diese Mail enthaelt vertrauliche und/oder rechtlich geschuetzte Informationen. Wenn Sie nicht der richtige Adressat sind oder diese Email irrtuemlich erhalten haben, informieren Sie bitte sofort den Absender und vernichten Sie diese Mail. Das unerlaubte Kopieren sowie die unbefugte Weitergabe dieser Mail ist nicht gestattet. This email may contain confidential and/or privileged information. If you are not the intended recipient (or have received this email in error) please notify the sender immediately and destroy this email. 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