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Re: [Xen-users] iscsi on xen

  • To: "sdawson@xxxxxxxxxxxxxxxx" <sdawson@xxxxxxxxxxxxxxxx>, "xen-users@xxxxxxxxxxxxx" <xen-users@xxxxxxxxxxxxx>
  • From: Eric <epretorious@xxxxxxxxx>
  • Date: Tue, 22 Jan 2013 16:15:21 -0800 (PST)
  • Delivery-date: Wed, 23 Jan 2013 00:16:40 +0000
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  • List-id: Xen user discussion <xen-users.lists.xen.org>

Thanks for sharing, Steve:

I noticed that you're using DRBD to replicate the LV's and then exporting the individual DRBD resources via iSCSI (instead of using DRBD to replicate the entire PV and then exporting the underlying block device to the iSCSI client [for cLVM]). This seems cumbersome as each new LV requires that a new DRBD resource and iSCSI LUN be defined. Have you tried using DRBD resources as whole PV's [and then exporting LV's]?

Check out the  Linbit Tech Guide "Highly available iSCSI with DRBD and Pacemaker" (http://www.linbit.com/en/downloads/tech-guides?download=9:highly-available-iscsi-with-drbd-and-pacemaker)

Eric Pretorious
Truckee, CA

From: Steve Dawson <sdawson@xxxxxxxxxxxxxxxx>
To: xen-users@xxxxxxxxxxxxx
Sent: Tuesday, January 22, 2013 2:15 PM
Subject: Re: [Xen-users] iscsi on xen

We export our logical volumes (LVM2) via iscsi LUNs to our xen boxes, one advantage of this scheme is you can connect more than one xen box to the iscsi targets to provide live migration support.

Our system looks like this..

PV --> VG --> LVM --> drbd --> iscsi-target =====LAN===== xen + iscsi-client

This is a production system with 8 xen boxes and 60 VMs and works very well.



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