Re: [Xen-users] lustre clustre file system and xen 3

[Karsten Nielsen <karsten-xen@xxxxxxxxxx>]

Christopher G. Stach II wrote:
> Karsten Nielsen wrote:
> > Mayby I frased my question wrong. I have read a lot on the mailing list
> > about pros and cons of different ways to make the file backend avalible
> > to multiple physical servers.
> >
> > But it seems that there are no real good answer to that question as fare
> > as I have read. There are pros and cons to every solution.
> >
> > What I was looking for is a file backend that performs very well and is
> > relayable.
> >
> > If I want to use ocfs2 I cannot resize the file system.
> > (http://www.mail-archive.com/ocfs2-users@xxxxxxxxxxxxxx/msg00059.html)
> > If I want to use GFS it's performence is not that great
> > (http://guialivre.governoeletronico.gov.br/mediawiki/index.php/TesteGFSGraficoRaid10_ext3vsgfs
> >   and
> > http://guialivre.governoeletronico.gov.br/mediawiki/index.php/TestesGFS )
> >
> > Mayby I am making this to complicated and should not worry about the
> > lock system of clustre file systems what I am looking for is realy
> > performance and relyability.
> >
> > Any hints ?
> > And why do you think that Lustre is at bad idea ?
> I think Lustre is fine, although it's most likely overkill for just two
> app servers.  DRBD is probably closer to what you want.  I think the
> file backend portion is a bad idea.  It's a bad idea to unnecessarily
> involve a filesystem cache.  Unless I had a very large cluster, I would
> still probably use GFS.
The reason fore having a file backend is that I will be able to live 
imigrate domU's from one server to the next in case of hardware failor 
or extremly high load on one of the physical servers.
If I understand you correct you suggest that I make a lot of storage 
avaliable on both application servers and syncronize data with DRBD ?
But if I add a 3. application server that setup does not work unless i 
add storage space on all three application servers and implement that in 
the DRBD ?
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