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Re: [Xen-users] iscsi on xen

  • To: xen-users <xen-users@xxxxxxxxxxxxx>
  • From: "Simon Hobson" <linux@xxxxxxxxxxxxxxxx>
  • Date: Wed, 23 Jan 2013 8:30:56 +0000
  • Delivery-date: Wed, 23 Jan 2013 08:31:44 +0000
  • List-id: Xen user discussion <xen-users.lists.xen.org>

Eric wrote:
> I think that Jacek is asking whether to:

> 1. export the logical volumes (i.e., LV's) from his LVM volume group (VG)
> as individual iSCSI LUN's or to
> 2. export the underlying partitions and then import them to his host
> system as physical volumes (PV's) and then parition create the VG and
> the LV's on the host system.

But there is no correct answer - it depends on various factors, not least your 
requirements and how you run your systems.

If you have one host, and no requirement to move any guests around, then 
mounting one iSCSI volume in the host and putting LVM on top of that will be 
the easiest way to go.

If you have multiple hosts and expect to need to move guests around, then one 
iSCSI volume/guest or one iSCSI volume/guest volume is the way to go. 
Alternatively, you either have to move guests by physically shutting it down 
and copying it's files (which has disk space management issues), or you have to 
run a clustered LVM on top of your single iSCSI volume.

The scripts mentioned by Carlos are designed to automate some of the headache 
of managing large numbers of iSCSI volumes - ie make option 2 easier to manage.

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