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<TITLE>Re: [CentOS] Xen, GFS, GNBD and DRBD?</TITLE>
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<P><FONT SIZE=2>Take a look at iSCSI for the storage servers. iSCSI Enterprise Target is what I use here and it works well for us.<BR>
<BR>
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.<BR>
<BR>
-Ross<BR>
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-----Original Message-----<BR>
From: centos-bounces@centos.org <centos-bounces@centos.org><BR>
To: CentOS mailing list <centos@centos.org><BR>
Sent: Wed Jan 02 17:44:19 2008<BR>
Subject: [CentOS] Xen, GFS, GNBD and DRBD?<BR>
<BR>
Hi all,<BR>
<BR>
We're looking at deploying a small Xen cluster to run some of our <BR>
smaller applications. I'm curious to get the lists opinions and advice <BR>
on what's needed.<BR>
<BR>
The plan at the moment is to have two or three servers running as the <BR>
Xen dom0 hosts and two servers running as storage servers. As we're <BR>
trying to do this on a small scale, there is no means to hook the <BR>
system into our SAN, so the storage servers do not have a shared <BR>
storage subsystem.<BR>
<BR>
Is it possible to run DRBD on the two storage servers and then export <BR>
the block devices over the network to the xen hosts? Ideally the goal <BR>
is to have the effect of shared storage on the xen hosts so that <BR>
domains can be migrated between them in case one server needs to go <BR>
offline. Do I run GFS on top of the DRBD mirrored device, exported via <BR>
GNBD to the xen hosts; or the other way around, using GNBD to export <BR>
the DRBD mirrored device and then GFS running on the xen hosts?<BR>
<BR>
Is this possible; is there an easier/simpler/better way to do it?<BR>
<BR>
Thanks,<BR>
Tom<BR>
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