[Linux-cluster] virtual machine failover with gfs

[Lon Hohberger]

On Wed, 2008-06-25 at 15:51 -0700, matt whiteley wrote:
> I have spent lots of hours trying different setups and reading the  
> documentation already so I hope this isn't a faq as I am new to the  
> list.
> 
> I read the Red Hat Magazine article on this topic[1], but have come to  
> realize that it might not be exactly what I am going for. I want to  
> have a group of nodes that run a group of virtual machines with  
> automated failover. I set things up how the article described but  
> realized I didn't want the gfs mount in the fstab file. I would like  
> the gfs mount described in the cluster.conf file so that as nodes are  
> added or removed the mount will follow the changes (I know about the 1  
> journal per node so have created a few extra already). When I add a  
> service to mount the gfs resource, it only gets mounted on one node as  
> is to be expected thinking in terms of other resources.


> I started thinking about this and it almost seems like gfs is  
> unnecessary. Should I have a file system per virtual machine that  
> wouldn't need to be gfs since only one node will ever run a virtual  
> machine at a time? Then mount/umount the file system as the virtual  
> machine was migrated in the cluster?

If you assign a raw SAN Lun to each virtual machine, you don't need GFS.

I would not bother making an EXT3 or other local file system and placing
a single VM image on it; it's not terribly practical.

-- Lon


> 
> It seems like I am missing something about how this should be setup  
> and I would really appreciate any tips or ideas. I will include my  
> cluster.conf in case it provides any more info.
> 
> As a side note, what is with all the errors from system-config- 
> kickstart telling me my config file is invalid if it was generated by  
> conga. Both versions are updated to the newest available.
> 
> 
> 
> [1] http://www.redhatmagazine.com/2007/08/23/automated-failover-and-recovery-of-virtualized-guests-in-advanced-platform/
> 
> thanks,
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