Re: Need help: super_total_bytes mismatch with fs_devices total_rw_bytes

[Qu Wenruo <quwenruo.btrfs@gmx.com>]

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On 2019/8/24 下午2:48, Patrick Dijkgraaf wrote:
> Hi all,
> 
> My server hung this morning, and I had to hard-reset is. I did not
> apply any updates. After the reboot, my FS won't mount:
> 
> [Sat Aug 24 08:16:31 2019] BTRFS error (device sde2): super_total_bytes
> 92017957797888 mismatch with fs_devices total_rw_bytes 184035915595776
> [Sat Aug 24 08:16:31 2019] BTRFS error (device sde2): failed to read
> chunk tree: -22
> [Sat Aug 24 08:16:31 2019] BTRFS error (device sde2): open_ctree failed
> 
> However, running btrfs rescue shows:
> root@cornelis ~]# btrfs rescue fix-device-size /dev/sdh2
> No device size related problem found

That's strange.

Would you please dump the chunk tree and super blocks?
# btrfs ins dump-super -fFa /dev/sdh2
# btrfs ins dump-tree -t chunk /dev/sdh2

And, have you tried to mount using different devices? If it's some super
blocks get corrupted, using a different device to mount may help.
(With that said, it's better to call that dump-super for each device)

> 
> FS config is shown below:
> [root@cornelis ~]# btrfs fi show
> Label: 'cornelis-btrfs'  uuid: ac643516-670e-40f3-aa4c-f329fc3795fd
> Total devices 1 FS bytes used 536.05GiB
> devid    1 size 800.00GiB used 630.02GiB path /dev/mapper/cornelis-
> cornelis--btrfs
> 
> Label: 'data'  uuid: 43472491-7bb3-418c-b476-874a52e8b2b0
> Total devices 16 FS bytes used 36.61TiB
> devid    1 size 7.28TiB used 2.65TiB path /dev/sde2
> devid    2 size 3.64TiB used 2.65TiB path /dev/sdf2
> devid    3 size 3.64TiB used 2.65TiB path /dev/sdg2
> devid    4 size 7.28TiB used 2.65TiB path /dev/sdh2
> devid    5 size 3.64TiB used 2.65TiB path /dev/sdi2
> devid    6 size 7.28TiB used 2.65TiB path /dev/sdj2
> devid    7 size 3.64TiB used 2.65TiB path /dev/sdk2
> devid    8 size 3.64TiB used 2.65TiB path /dev/sdl2
> devid    9 size 7.28TiB used 2.65TiB path /dev/sdm2
> devid   10 size 3.64TiB used 2.65TiB path /dev/sdn2
> devid   11 size 7.28TiB used 2.65TiB path /dev/sdo2
> devid   12 size 3.64TiB used 2.65TiB path /dev/sdp2
> devid   13 size 7.28TiB used 2.65TiB path /dev/sdq2
> devid   14 size 7.28TiB used 2.65TiB path /dev/sdr2
> devid   15 size 3.64TiB used 2.65TiB path /dev/sds2
> devid   16 size 3.64TiB used 2.65TiB path /dev/sdt2

What's the profile used on so many devices?
RAID10?

The simplest way to fix it is to just update the

Thanks,
Qu
> 
> Other info:
> [root@cornelis ~]# uname -r
> 4.18.16-arch1-1-ARCH
> 
> I was able to mount is using:
> [root@cornelis ~]# mount -o usebackuproot,ro /dev/sdh2 /mnt/data
> 
> Now updating my backup, but I REALLY hope to get this fixed on the
> production server!
> 


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