[Linux-cluster] RE: Can't create LV in 2-node cluster

[John Ruemker]

michael.osullivan at auckland.ac.nz wrote:
> Hi Mark,
>
> clvmd is running fine on both nodes. The result of "service clvmd status" is
>
> clvmd (pid xxxxx) is running...
> active volumes: LogVol00 LogVol01
>
> The result of vgscan is
>
> Reading all physical volumes. This may take a while...
> Found volume group "iscsi_raid_vg" using metadata type lvm2
> Found volume group "VolGroup00" using metadata type lvm2
>
> I just can't create a logical volume either from the command line or using
> system-config-lvm...

Did you partition the device before adding a physical volume to it?  If 
so, did you run partprobe on both nodes?  A common scenario is to 
partition the device from node 1 and create a physical volume on it.  
However the partition table is not automatically read on the second node 
so it has no idea there is a partition there.  When clvmd tells the 
second node to activate a vg or lv on this unknown device, that node 
responds that it can't lock on to the device since it has no idea what 
it is.  If you do end up in this situation then usually the solution is 
to do this on both nodes

   # rm /etc/lvm/cache/.cache
   # partprobe
   # clvmd -R

Then from one node:

   # pvscan
   # vgscan
   # lvchange -ay vg/lv

Try this and see if it helps. 

-John