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RE: [Xen-users] iSCSI and LVM

  • To: "Jeff Sturm" <jeff.sturm@xxxxxxxxxx>, <Xen-users@xxxxxxxxxxxxxxxxxxx>
  • From: "Jonathan Tripathy" <jonnyt@xxxxxxxxxxx>
  • Date: Mon, 14 Jun 2010 15:18:27 +0100
  • Cc:
  • Delivery-date: Mon, 14 Jun 2010 07:20:21 -0700
  • List-id: Xen user discussion <xen-users.lists.xensource.com>
  • Thread-index: AcsLxatGY639P5zVRU2r7oLbch+uUwAAdkOdAADT2mAAAGhcrQ==
  • Thread-topic: [Xen-users] iSCSI and LVM

I'm using Ubuntu, so I'm not sure if CLVM is the best option..
Does anyone have any experience with "shared storage" using iSCSI with Debian/Ubuntu Dom0s?

From: Jeff Sturm [mailto:jeff.sturm@xxxxxxxxxx]
Sent: Mon 14/06/2010 15:11
To: Jonathan Tripathy; Xen-users@xxxxxxxxxxxxxxxxxxx
Subject: RE: [Xen-users] iSCSI and LVM

If you can run cluster services on your dom0 hosts (easy with CentOS/RHEL, don't know about others), you can also use CLVM.   That allows both hosts to see all logical volumes.  You can perform volume operations (create/exend/remove/etc) from either node, and use Xen migration.


From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Jonathan Tripathy
Sent: Monday, June 14, 2010 9:43 AM
To: Xen-users@xxxxxxxxxxxxxxxxxxx
Subject: RE: [Xen-users] iSCSI and LVM


Or should I export the whole RAID10 array via a single iSCSI LUN, and make the 2 server connect to the same iSCSI target (is this possible??). This would allow migration I guess.


Any help on best practises is appreciated




From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx on behalf of Jonathan Tripathy
Sent: Mon 14/06/2010 14:29
To: Xen-users@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-users] iSCSI and LVM

Hi Everyone,


I am going to get a storage server which will be connected to my Xen hosts via iSCSI/Ethernet. I wish to use LVM for the DomU disks. The storage server will have a RAID10 array, and 2 Xen hosts will connect to this (Each will have a 50% share of the RAID10 array, space wise).


What is the best way to go about this? Should I:


a) Split the RAID10 array into 2 partition on the storage server, and export 1 partition to each xen host, then let the Xen host manage LVM?




b) Do all LVM stuff on the storage server and export each LVM logical volume to the correct Xen hosts via iSCSI? Since each host could have around 100 VMs on it, that's a lot of iSCSI exporting!


Any help is appreciated





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