[Gluster-users] Gluster does not seem to detect a split-brain situation
Joe Julian
joe at julianfamily.org
Sun Jun 7 20:09:21 UTC 2015
(oops... I hate when I reply off-list)
That warning should, imho, be an error. That's saying that the handle,
which should be a hardlink to the file, doesn't have a matching inode.
It should if it's a hardlink.
If it were me, I would:
find /export/sdb1/data/.glusterfs -type f -links 1 -print0 | xargs
/bin/rm
This would clean up any handles that are not hardlinked where they
should be and will allow gluster to repair them.
Btw, the self-heal errors would be in glustershd.log and/or the client
mount log(s), not (usually) the brick logs.
On 06/07/2015 12:21 PM, Sjors Gielen wrote:
> Oops! Accidentally ran the command as non-root on Curacao, that's why
> there was no output. The actual output is:
>
> curacao# getfattr -m . -d -e hex
> /export/sdb1/data/Case/21000355/studies.dat
> getfattr: Removing leading '/' from absolute path names
> # file: export/sdb1/data/Case/21000355/studies.dat
> trusted.afr.data-client-0=0x000000000000000000000000
> trusted.afr.data-client-1=0x000000000000000000000000
> trusted.afr.dirty=0x000000000000000000000000
> trusted.gfid=0xfb34574974cf4804b8b80789738c0f81
>
> For reference, the output on bonaire:
>
> bonaire# getfattr -m . -d -e hex
> /export/sdb1/data/Case/21000355/studies.dat
> getfattr: Removing leading '/' from absolute path names
> # file: export/sdb1/data/Case/21000355/studies.dat
> trusted.gfid=0xfb34574974cf4804b8b80789738c0f81
>
> Op zo 7 jun. 2015 om 21:13 schreef Sjors Gielen <sjors at sjorsgielen.nl
> <mailto:sjors at sjorsgielen.nl>>:
>
> I'm reading about quorums, I haven't set up anything like that yet.
>
> (In reply to Joe Julian, who responded off-list)
>
> The output of getfattr on bonaire:
>
> bonaire# getfattr -m . -d -e hex
> /export/sdb1/data/Case/21000355/studies.dat
> getfattr: Removing leading '/' from absolute path names
> # file: export/sdb1/data/Case/21000355/studies.dat
> trusted.gfid=0xfb34574974cf4804b8b80789738c0f81
>
> On curacao, the command gives no output.
>
> From `gluster volume status`, it seems that while the "brick
> curacao:/export/sdb1/data" is online, it has no associated port
> number. Curacao can connect to the port number provided by Bonaire
> just fine. There are no firewalls on/between the two machines,
> they are on the same subnet connected by Ethernet cables and two
> switches.
>
> By the way, warning messages just started appearing to
> /var/log/glusterfs/bricks/export-sdb1-data.log on Bonaire saying
> "mismatching ino/dev between file X and handle Y", though, maybe
> only just now even though I started the full self-heal hours ago.
>
> [2015-06-07 19:10:39.624393] W
> [posix-handle.c:727:posix_handle_hard] 0-data-posix: mismatching
> ino/dev between file
> /export/sdb1/data/Archive/S21/21008971/studies.dat
> (9127104621/2065) and handle
> /export/sdb1/data/.glusterfs/97/c2/97c2a65d-36e0-4566-a5c1-5925f97af1fd
> (9190215976/2065)
>
> Thanks again!
> Sjors
>
> Op zo 7 jun. 2015 om 19:13 schreef Sjors Gielen
> <sjors at sjorsgielen.nl <mailto:sjors at sjorsgielen.nl>>:
>
> Hi all,
>
> I work at a small, 8-person company that uses Gluster for its
> primary data storage. We have a volume called "data" that is
> replicated over two servers (details below). This worked
> perfectly for over a year, but lately we've been noticing some
> mismatches between the two bricks, so it seems there has been
> some split-brain situation that is not being detected or
> resolved. I have two questions about this:
>
> 1) I expected Gluster to (eventually) detect a situation like
> this; why doesn't it?
> 2) How do I fix this situation? I've tried an explicit 'heal',
> but that didn't seem to change anything.
>
> Thanks a lot for your help!
> Sjors
>
> ------8<------
>
> Volume & peer info: http://pastebin.com/PN7tRXdU
> curacao# md5sum /export/sdb1/data/Case/21000355/studies.dat
> 7bc2daec6be953ffae920d81fe6fa25c
> /export/sdb1/data/Case/21000355/studies.dat
> bonaire# md5sum /export/sdb1/data/Case/21000355/studies.dat
> 28c950a1e2a5f33c53a725bf8cd72681
> /export/sdb1/data/Case/21000355/studies.dat
>
> # mallorca is one of the clients
> mallorca# md5sum /data/Case/21000355/studies.dat
> 7bc2daec6be953ffae920d81fe6fa25c /data/Case/21000355/studies.dat
>
> I expected an input/output error after reading this file,
> because of the split-brain situation, but got none. There are
> no entries in the GlusterFS logs of either bonaire or curacao.
>
> bonaire# gluster volume heal data full
> Launching heal operation to perform full self heal on volume
> data has been successful
> Use heal info commands to check status
> bonaire# gluster volume heal data info
> Brick bonaire:/export/sdb1/data/
> Number of entries: 0
>
> Brick curacao:/export/sdb1/data/
> Number of entries: 0
>
> (Same output on curacao, and hours after this, the md5sums on
> both bricks still differ.)
>
> curacao# gluster --version
> glusterfs 3.6.2 built on Mar 2 2015 14:05:34
> Repository revision: git://git.gluster.com/glusterfs.git
> <http://git.gluster.com/glusterfs.git>
> (Same version on Bonaire)
>
>
>
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