[Linux-cluster] lvm2-cluster not syncing correctly?

Simon Hargrave szhargrave at ybs.co.uk
Thu Feb 24 16:13:52 UTC 2011

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I'm creating an (at present) 2 node cluster to share GFS2 filesystems.  Everything seems to be working reasonably OK apart from one issue which may or may not be a bug.
I have a cluster volume group called vgGWPOCSHARED mounted on 2 nodes.  I can "vgdisplay -v" and "vgdisplay -v vgGWPOCSHARED" to my hearts content on either node with no problem.
I now create a logical volume on the first node, e.g. lvcreate -n test -L 1G vgGWPOCSHARED.  The output of "vgdisplay -v" and "vgdisplay -v vgGWPOCSHARED" on the local node show the new logical volume as expected.
However, if I now perform the same 2 commands on the second node, something strange happens.
"vgdisplay -v" shows the state of vgGWPOCSHARED /before/ the new logical volume was created.  It also give the following in stderr: -
    Archiving volume group "vgGWPOCSHARED" metadata (seqno 21).
    Archiving volume group "vgGWPOCSHARED" metadata (seqno 20).
    Creating volume group backup "/etc/lvm/backup/vgGWPOCSHARED" (seqno 20).

However if I then do a "vgdisplay -v vgGWPOCSHARED", I see the new logical volume, but also the stderr output: -
    Archiving volume group "vgGWPOCSHARED" metadata (seqno 20).
    Archiving volume group "vgGWPOCSHARED" metadata (seqno 21).
    Creating volume group backup "/etc/lvm/backup/vgGWPOCSHARED" (seqno 21).

Alternating between the 2 commands repeats the output.  It's as if clvmd isn't "fully" updating something and that something's cached, but I'm not sure what.
If I unmount my gfs2 filesystems and restart clvmd,
service gfs2 stop
service clvmd stop
service clvmd start
service gfs2 start
Then everything returns to normal and the outputs match.
Is this something anyone has seen/can reproduce/has any idea about?
Versions are: -

Server is RHEL 5 x86_64 updated from the channel on 21st Feb this year.
Simon Hargrave szhargrave at ybs.co.uk <blocked::blocked::mailto:szhargrave at ybs.co.uk>  
Technical Services Team Leader x2831
Yorkshire Building Society 01274 472831

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