[Linux-cluster] adding volume to cluster

[John Ruemker]

Terry Davis wrote:
> Awesome.  I rebooted and applied all available updates and now it 
> works.  Only thing worth noting in the updates was a kernel update to 
> 2.6.18-92.1.13.el5.  I think a reboot did it (for some reason).
>
> On Wed, Oct 1, 2008 at 12:06 PM, Terry Davis <terrybdavis at gmail.com 
> <mailto:terrybdavis at gmail.com>> wrote:
>
>     On Wed, Oct 1, 2008 at 11:42 AM, Alasdair G Kergon <agk at redhat.com
>     <mailto:agk at redhat.com>> wrote:
>
>         I hope that problem was fixed in newer packages.
>
>         Meanwhile try running 'clvmd -R' between some of the commands.
>
>         If all else fails, you may have to kill the clvmd daemons in
>         the cluster
>         and restart them, or even add a 'vgscan' on each node before
>         the restart.
>
>         Alasdair
>         --
>         agk at redhat.com <mailto:agk at redhat.com>
>
>
>
>     Just a sanity check.  I killed all the clvmd daemons and started
>     clvmd back up.  I created the PV on node A:
>
>     [root at omadvnfs01a ~]# pvcreate /dev/sdh1
>       Physical volume "/dev/sdh1" successfully created
>
>     Node B knows nothing of /dev/sdh1 but it does exist:
>     [root at omadvnfs01b ~]# ls /dev/sdh*
>     /dev/sdh
>

This is the problem.  If you partition the device on one node, you must 
do a 'partprobe' on all nodes so that they update their partition 
tables.  Without doing this LVM has no idea what /dev/sdh1 is and 
therefore cannot lock on it.  After running partprobe do 'clvmd -R' so 
that clvmd reloads its device cache and knows which devices are 
available.  After that you can proceed with pvcreate, vgcreate, 
lvcreate, etc. 

John