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Re: [Xen-users] Shared Storage

To: Jonathan Dye <jdye@xxxxxxxxxxxxxxxxxxxxx>, Xen List <xen-users@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-users] Shared Storage
From: Jonathan Tripathy <jonnyt@xxxxxxxxxxx>
Date: Sun, 24 Apr 2011 19:31:33 +0100
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We're talking houndreds, if not thousands of DomUs here. Will iSCSI on Linux scale to these large numbers?


On 24/04/2011 19:13, Jonathan Dye wrote:
Why not create one iscsi lun per vm disk instead of carving them up on the 
hypervisor?  That's more typical, and a more typical state of affairs in linux 
is your friend.  Also, you would have just one lun queue if you exported one 
big PV, instead of one lun queue per vbd. That becomes a problem at scale.

- Jonathan

----- Original Message -----
From: "Jonathan Tripathy"<jonnyt@xxxxxxxxxxx>
To: "Xen List"<xen-users@xxxxxxxxxxxxxxxxxxx>
Sent: Sunday, April 24, 2011 11:25:38 AM
Subject: [Xen-users] Shared Storage

Hi Everyone,

I am consider such a setup where I export an iSCSI target to a Xen node.
This Xen node will then use the iSCSI block device as an LVM PV, and
create lots of LVs for DomU use.

I was wondering if anyone could make me aware of any special
consideration I would need to take. I've posted a similar question to
the LVM list to ask for further tips more specific to LVM.

Am I barking down the wrong path here? I know it would be very easy to
just an NFS server and use image files, but this will be for a large
scale DomU hosting so this isn't really an option. Additionally, if I
wanted to make the LVM VG visible to multiple Xen nodes, is it just a
matter of running CLVM on each Xen node? Please keep in mind that only
one Xen node will be using an LV at any one time (so no need for GFS, I

Any help or tips would be appreciated


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