[Gluster-users] Possible split brain situation?

[Andrea Veri]

And the link. [1]

[1]
https://access.redhat.com/sites/default/files/attachments/rhstorage_split-brain_20131120_0.pdf


2014-08-17 23:35 GMT+02:00 Andrea Veri <andrea.veri at gmail.com>:

> Hi,
>
> while verifying the heal information for one of the hosted bricks I found
> out a few entries were not properly in sync anymore (I wondered how that
> could be possible as just one node is serving the data and the other is
> there as a backup and no, I had no downtime that could have made the
> gluster fuse client to switch to the other available node), after following
> the documentation at [1] I removed both the offending files and the
> respective hard links from the .glusterfs directory, (I found the
> '-samefile' flag of 'find' very handy for this job) but then I still had a
> few standing entries that would not report what file they were affecting
> but just the relevant gfid, in particular:
>
> sudo gluster volume heal mailman info
> Brick brick01:/mnt/gluster_volumes/mailman/
> <gfid:7220e73e-d0c6-4f03-a541-b59fa713db7b>
> <gfid:a58e2209-0281-46e6-91d7-44e3fb06d6fa>
> <gfid:c5bd1fe9-a19a-4b32-a5a5-83f9f6d5d425>
> <gfid:5985ae98-78c0-4b84-840a-7149093e79dc>
> Number of entries: 4
>
> Brick brick02:/mnt/gluster_volumes/mailman/
> 7220e73e-d0c6-4f03-a541-b59fa713db7b
> Number of entries: 1
>
> The relevant log entries:
>
> [2014-08-17 21:04:07.747654] E
> [afr-self-heal-common.c:233:afr_sh_print_split_brain_log]
> 0-mailman-replicate-0: Unable to self-heal contents of
> '7220e73e-d0c6-4f03-a541-b59fa713db7b' (possible split-brain). Please
> delete the file from all but the preferred subvolume.- Pending matrix:  [ [
> 0 4 ] [ 2 0 ] ]
>
> Am I in presence of another split brain situation? additionally the
> process that should be accessing the files I touched is reporting me an
> "Input/Output" error when trying to write to the glusterfs-mounted
> directory. (not on the whole brick but just on the directory that had the
> original split-brain)
>
> Thanks in advance!
>
>
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