* Re: btrfs pool failure - bad superblock
[not found] <CAG_uc2NkAOAnZtW=+cAR3YfH4frfqooJugjzCDZX161wnKDnqg@mail.gmail.com>
@ 2020-04-09 14:34 ` Zak Lantz
0 siblings, 0 replies; only message in thread
From: Zak Lantz @ 2020-04-09 14:34 UTC (permalink / raw)
To: linux-btrfs
Hello,
I recently had a drive fail in my btrfs pool. I rebooted to pull the
bad drive. Upon boot, I can no longer mount the remaining drive's
partition. I have tried btrfs restore as well and both complain about
a bad superblock as well as the backup superblock.
If I try and run a super-recover, all supers display as being good.
Any help would be appreciated.
Thanks
root@stylophora:~# mount -o degraded,usebackuproot,ro /dev/sdc1
/mnt/user/btrfsbackup
mount: /mnt/user/btrfsbackup: wrong fs type, bad option, bad
superblock on /dev/sdc1, missing codepage or helper program, or other
error.
root@stylophora:~# btrfs restore -v -u 1 /dev/sdc1 /mnt/user/Backup/cachebck
warning, device 2 is missing
bad tree block 578836021248, bytenr mismatch, want=578836021248, have=0
ERROR: cannot read chunk root
Could not open root, trying backup super
warning, device 2 is missing
bad tree block 578836021248, bytenr mismatch, want=578836021248, have=0
ERROR: cannot read chunk root
Could not open root, trying backup super
root@stylophora:~# btrfs rescue super-recover -v /dev/sdc1
All Devices:
Device: id = 3, name = /dev/sdc1
Before Recovering:
[All good supers]:
device name = /dev/sdc1
superblock bytenr = 65536
device name = /dev/sdc1
superblock bytenr = 67108864
device name = /dev/sdc1
superblock bytenr = 274877906944
[All bad supers]:
All supers are valid, no need to recover
root@stylophora:~# uname -a
btrfs --version
Linux stylophora 4.19.98-Unraid #1 SMP Sun Feb 2 20:47:34 GMT 2020
x86_64 Intel(R) Xeon(R) CPU X5680 @ 3.33GHz GenuineIntel
GNU/Linux
root@stylophora:~# btrfs --version
btrfs-progs v5.4
root@stylophora:~# btrfs fi show
Label: none uuid: fe361bb0-4606-4eb0-a18f-f741b163c052
Total devices 1 FS bytes used 376.00KiB
devid 1 size 50.00GiB used 536.00MiB path /dev/loop2
Label: none uuid: aea70e3c-11b6-43f9-b08d-c4c38dda2887
Total devices 1 FS bytes used 332.00KiB
devid 1 size 1.00GiB used 126.38MiB path /dev/loop3
warning, device 2 is missing
bad tree block 578836021248, bytenr mismatch, want=578836021248, have=0
ERROR: cannot read chunk root
Label: none uuid: eccae6e7-e489-4019-9e4d-501445eff3d8
Total devices 2 FS bytes used 507.73GiB
devid 3 size 931.51GiB used 523.00GiB path /dev/sdc1
*** Some devices missing
On Thu, Apr 9, 2020 at 10:16 AM Zak Lantz <zakodewald@gmail.com> wrote:
>
> Hello,
>
> I recently had a drive fail in my btrfs pool. I rebooted to pull the bad drive. Upon boot, I can no longer mount the remaining drive's partition. I have tried btrfs restore as well and both complain about a bad superblock as well as the backup superblock.
> If I try and run a super-recover, all supers display as being good.
> Any help would be appreciated.
>
> Thanks
>
> root@stylophora:~# mount -o degraded,usebackuproot,ro /dev/sdc1 /mnt/user/btrfsbackup
> mount: /mnt/user/btrfsbackup: wrong fs type, bad option, bad superblock on /dev/sdc1, missing codepage or helper program, or other error.
> root@stylophora:~# btrfs restore -v -u 1 /dev/sdc1 /mnt/user/Backup/cachebck
> warning, device 2 is missing
> bad tree block 578836021248, bytenr mismatch, want=578836021248, have=0
> ERROR: cannot read chunk root
> Could not open root, trying backup super
> warning, device 2 is missing
> bad tree block 578836021248, bytenr mismatch, want=578836021248, have=0
> ERROR: cannot read chunk root
> Could not open root, trying backup super
> root@stylophora:~# btrfs rescue super-recover -v /dev/sdc1
> All Devices:
> Device: id = 3, name = /dev/sdc1
>
> Before Recovering:
> [All good supers]:
> device name = /dev/sdc1
> superblock bytenr = 65536
>
> device name = /dev/sdc1
> superblock bytenr = 67108864
>
> device name = /dev/sdc1
> superblock bytenr = 274877906944
>
> [All bad supers]:
>
> All supers are valid, no need to recover
> root@stylophora:~# uname -a
> btrfs --version
> Linux stylophora 4.19.98-Unraid #1 SMP Sun Feb 2 20:47:34 GMT 2020 x86_64 Intel(R) Xeon(R) CPU X5680 @ 3.33GHz GenuineIntel GNU/Linux
> root@stylophora:~# btrfs --version
> btrfs-progs v5.4
> root@stylophora:~# btrfs fi show
> Label: none uuid: fe361bb0-4606-4eb0-a18f-f741b163c052
> Total devices 1 FS bytes used 376.00KiB
> devid 1 size 50.00GiB used 536.00MiB path /dev/loop2
>
> Label: none uuid: aea70e3c-11b6-43f9-b08d-c4c38dda2887
> Total devices 1 FS bytes used 332.00KiB
> devid 1 size 1.00GiB used 126.38MiB path /dev/loop3
>
> warning, device 2 is missing
> bad tree block 578836021248, bytenr mismatch, want=578836021248, have=0
> ERROR: cannot read chunk root
> Label: none uuid: eccae6e7-e489-4019-9e4d-501445eff3d8
> Total devices 2 FS bytes used 507.73GiB
> devid 3 size 931.51GiB used 523.00GiB path /dev/sdc1
> *** Some devices missing
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