[Linux-cluster] Re: CLVM and Cluster Service Migration issues

[James Chamberlain]

On Thu, 20 Dec 2007, Jonathan Biggar wrote:

> James Chamberlain wrote:
>>  Hi all,
>>
>>  I've got a three node CentOS 5 x86-64 CS/GFS cluster running kernel
>>  2.6.18-53.el5.  Last night, I tried to grow two of the file systems on it.
>>  I ran lvextend and then gfs_grow on node3, with node2 serving the file
>>  systems out to the local network.  While gfs_grow was running, node2
>>  failed the service and I couldn't get it to restart.  It looked to me like
>>  neither node1 nor node2 was aware of the lvextend I had run on node3.  I
>>  had to reboot the full cluster to bring everything back online.
>
> If you ran lvextend on node3 while node2 had the filesystem mounted and 
> exported via NFS, then you did the wrong thing.  CLVM lets the nodes share 
> information about the PVs, VGs and LVs, but not information about the 
> contents of an LV.
>
> You needed to run lvextend on the node that had the filesystem mounted.

All three nodes had the (GFS) filesystem mounted.  I'll note that exactly 
this operation this worked for me a couple of weeks ago on a CentOS 4 
CS/GFS cluster.

Thanks,

James