[Gluster-users] Gluster does not seem to detect a split-brain situation

[Юрий Полторацкий]

Hi,

First, I do not think that you have a split-brain.  I have a split-brain 
and my `gluster volume heal info` is:
gluster> volume heal vol3 info
Brick node5.virt.local:/storage/brick12/
/5d0bb2f3-f903-4349-b6a5-25b549affe5f/dom_md/ids - Is in split-brain

Number of entries: 1

Brick node6.virt.local:/storage/brick13/
/5d0bb2f3-f903-4349-b6a5-25b549affe5f/dom_md/ids - Is in split-brain

Number of entries: 1

Second, you would setup a quorum. Some info you can sea here 
<https://access.redhat.com/documentation/en-US/Red_Hat_Storage/3/html/Administration_Guide/sect-Managing_Split-brain.html>. 
My config is (two server with replica 2):
cluster.server-quorum-type: server
cluster.quorum-type: fixed
cluster.quorum-count: 1
cluster.server-quorum-ratio: 51%


And the last, I am a new in Gluster, so can be wrong.


07.06.2015 20:13, Sjors Gielen пишет:
> 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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