Re: [Xen-users] cluster filesystems

[Peter Fokkinga <peter@xxxxxxxxxxx>]

Quoting Brock Edward Palen <brockp@xxxxxxxxx>:
> Ive just been reading on ocfs2 and a lwn article
> http://lwn.net/Articles/137278/
> and makes the comment that its ment to be used: "s meant to operate 
> with a disk which is, itself, shared across the cluster
> (perhaps via some sort of storage-area network or multipath scheme)."
> So this requires some sort of NAS unit?  or does it work like PVFS2 
> ware each machine has its own local disk holding only a portion of 
> the data?
If you want to share a disk using ocfs2 to multiple _physical_
servers you will probably need a SAN (expensive...) I once
read about sharing a disk between hosts using firewire, but
that's really a hobby solution ;-)

In Xen however it's really simple, you just export a volume
(whether it's a file, a partition or a LVM volume) from dom0
to multiple domU's. It's really not much different than exporting
an ext3 volume. Well, you do need a view ocfs2 processes in each
domU  that talk to each other (tcp, on port 7777) but you
definitely do not need a SAN.

Peter



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