Re: [Xen-users] cluster filesystems

[Peter Fokkinga <peter@xxxxxxxxxxx>]

Quoting "Christopher G. Stach II" <cgs@xxxxxxxxx>:
> Andrej Radonic wrote:
> > Peter,
> > this may be a stupid question but what do you mean by "In Xen it's
> > really simple" as opposed to the SAN approach?
> > OCFS2 is "just" a filesystem, it doesn't seem to be a way of
> > distributing blockdevices via ethernet like NFS does.
> > So what is the point in using OCFS2 in conjunction with Xen without 
> > a SAN or iSCSI or multipath infrastructure?
> > If I understood Brock correctly he is looking for a robust and probably
> > high-performance (and cheap) alternative to NFS (I am too...).
> > Thanks ahead for some "enlightening" thoughts.
> The difference is between sharing between physical machines over a 
> network vs. sharing between virtual machines in a single physical 
> machine.
Yes, that's precisely what I meant. Ocfs2 in my situation is
a replacement for NFS for sharing files between domU's on
the same physical server. I basically virtualize the SAN,
but this only works for the domU's that exist on the same
physical server.

If you have different physical servers that need a shared
storage (for performance or high availability reasons) then,
as far as I know, you need to spend big money on a SAN, or
iSCSI, etc.

Peter

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