Xen project Mailing List

[Xen-users] Shared Storage

From: Joseph Glanville <joseph.glanville@xxxxxxxxxxxxxx>

Date: Wed, 27 Apr 2011 21:27:40 +1000

Delivery-date: Wed, 27 Apr 2011 04:31:11 -0700

List-id: Xen user discussion <xen-users.lists.xensource.com>

But yes, cLVM is not required to build a setup where a single large LUN is exported to multiple hypervisors as long as you manage the LVM metadata on a single host. If you need to manage it on multiple hosts make sure you script running an lvscan on the other hosts to switch the logical volumes to active.

If you are running a RHEL environment I highly suggest looking into cLVM and the rest of the RHEL cluster suite as it makes alot of what you are trying to do alot easier. If not there is plenty of room left for hackery. :)

For those that have suggested Infiniband I would also put my vote behind it. Our solutions are developed on Infiniband and are some of the fastest in the world (or fastest in the case of cloud storage) and we are yet to saturate the bandwith of bonded DDR which is 40gbit. Price per port it is not that far from 10GbE but much more useful and resilient.

Joseph.

On 27 April 2011 03:01, John Madden <jmadden@xxxxxxxxxxx> wrote:

Am I missing something here? Is it possible to do live migrations
using SR type LVMoiSCSI? The reason I ask is because the discussion
made me think it would not be possible.

I don't know what "SR" means but yes, you can do live migrations even without cLVM. All cLVM does is ensure consistency in LVM metadata changes across the cluster. Xen itself prevents the source and destination dom0's from trashing the disk during live migration. Other multi-node trashings are left to lock managers like OCFS2, GFS, not-being-dumb, etc.

John

--
John Madden
Sr UNIX Systems Engineer / Office of Technology
Ivy Tech Community College of Indiana
jmadden@xxxxxxxxxxx

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--
Kind regards,

Joseph.

Founder | Director

Orion Virtualisation Solutions | www.orionvm.com.au | Phone: 1300 56 99 52 | Mobile: 0428 754 846

Kind regards,

Joseph.

Founder | Director

Orion Virtualisation Solutions | www.orionvm.com.au | Phone: 1300 56 99 52 | Mobile: 0428 754 846

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