Re: [Xen-users] iSCSI Volumes and Xen

On Tue, Jan 12, 2010 at 09:13:14PM +0000, Simon Hobson wrote:
> Joseph Coleman wrote:
> 
> >I am moving away from NFS due to performance issues and going to 
> >iSCSI I have a 4 node environment that I am going to cluster. 
> >However, when I share out the iSCSI volume with all 4 servers and 
> >mount the volume as /var/vm  on the servers they are unable to view 
> >the files or folders the other server creates. How can I get around 
> >this?
> 
> Step 1 to fixing this is to realise that iSCSI is **NOT** a shared 
> file system - ie it will **NOT** replace NFS directly. Mounting a 
> volume on more than one system at once without a cluster filesystem 
> is absolutely guaranteed to destroy the filesystem as each system 
> writes what **it** thinks is the correct data on the virtual disk.
> 
> So you have two choices - mount it on one system and share it (eg via 
> NFS) to the others, or use a cluster filesystem on all the systems 
> that use it.
> 

or use CLVM.. 

-- Pasi


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