On 07/11/2018 02:09 AM, Marc MERLIN wrote:
Thanks to Su and Qu, I was able to get my filesystem to a point that
it's mountable.
I then deleted loads of snapshots and I'm down to 26.
IT now looks like this:
gargamel:~# btrfs fi show /mnt/mnt
Label: 'dshelf2' uuid: 0f1a0c9f-4e54-4fa7-8736-fd50818ff73d
Total devices 1 FS bytes used 12.30TiB
devid 1 size 14.55TiB used 13.81TiB path /dev/mapper/dshelf2
gargamel:~# btrfs fi df /mnt/mnt
Data, single: total=13.57TiB, used=12.19TiB
System, DUP: total=32.00MiB, used=1.55MiB
Metadata, DUP: total=124.50GiB, used=115.62GiB
Metadata, single: total=216.00MiB, used=0.00B
GlobalReserve, single: total=512.00MiB, used=0.00B
Problems
1) btrfs check --repair _still_ takes all 32GB of RAM and crashes the
server, despite my deleting lots of snapshots.
Is it because I have too many files then?
Yes. Original check first gather all infomation about extent tree and
your files in RAM, then process one by one.
But deleting still counts, it does speed lowmem check up.
2) I tried Su's master git branch for btrfs-progs to try and see how
Oh..No... My master branch is still 4.14. The true mater branch is
David's here:
https://github.com/kdave/btrfs-progs
But the master branch has a known bug which I fixed yesterday, please
see the mail.
Thanks,
Su
normal check would go, and I'm stuck on this:
gargamel:/var/local/src/btrfs-progs.sy# time ./btrfsck --mode=lowmem --repair
/dev/mapper/dshelf2
enabling repair mode
WARNING: low-memory mode repair support is only partial
Checking filesystem on /dev/mapper/dshelf2
UUID: 0f1a0c9f-4e54-4fa7-8736-fd50818ff73d
root 18446744073709551607 has a root item with a more recent gen (143376)
compared to the found root node (139061)
ERROR: failed to repair root items: Invalid argument
Thanks to the failure, the old version didn't do any things wrong.
real 75m8.046s
user 0m14.591s
sys 0m52.431s
I understand what the message means, I just need to switch to the newer root
but honestly I'm not quite sure how to do this from the btrfs-check man page.
This didn't work:
time ./btrfsck --mode=lowmem --repair --chunk-root=18446744073709551607
/dev/mapper/dshelf2
enabling repair mode
WARNING: low-memory mode repair support is only partial
WARNING: chunk_root_bytenr 18446744073709551607 is unaligned to 4096, ignore it
How do I address the error above?
Thanks
Marc
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