Take a look at iSCSI for the storage servers. iSCSI Enterprise Target is what I use here and it works well for us.
You don't really need shared filesystems if you are doing direct block io to LVs or raw partitions as the Xen migration will handle the hand-off, but you will if you are using flat files, because of this I recommend using LVs or raw partitions as clustered filesystems will put a serious overhead on the Xen guest io.
-Ross
-----Original Message-----
From: centos-bounces@xxxxxxxxxx <centos-bounces@xxxxxxxxxx>
To: CentOS mailing list <centos@xxxxxxxxxx>
Sent: Wed Jan 02 17:44:19 2008
Subject: Xen, GFS, GNBD and DRBD?
Hi all,
We're looking at deploying a small Xen cluster to run some of our
smaller applications. I'm curious to get the lists opinions and advice
on what's needed.
The plan at the moment is to have two or three servers running as the
Xen dom0 hosts and two servers running as storage servers. As we're
trying to do this on a small scale, there is no means to hook the
system into our SAN, so the storage servers do not have a shared
storage subsystem.
Is it possible to run DRBD on the two storage servers and then export
the block devices over the network to the xen hosts? Ideally the goal
is to have the effect of shared storage on the xen hosts so that
domains can be migrated between them in case one server needs to go
offline. Do I run GFS on top of the DRBD mirrored device, exported via
GNBD to the xen hosts; or the other way around, using GNBD to export
the DRBD mirrored device and then GFS running on the xen hosts?
Is this possible; is there an easier/simpler/better way to do it?
Thanks,
Tom
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