Re: [Xen-users] iscsi on xen

[Peter Braun <xenware@xxxxxxxxx>]

Btw: we are using iscsi with xen for about 5 years.

One lun and several lvm partitions above it to host domU.

Recently we had power problem in DC and we came into problem that
initializing LVM disk is very very slow when LVM snapshots are in use.




2013/1/23 Eric <epretorious@xxxxxxxxx>:
> 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.
>
> Regards.
>
> Steve.
>
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