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From: "Itamar Heim" <iheim@redhat.com> To: "Sahina Bose" <sabose@redhat.com> Cc: "engine-devel" <engine-devel@ovirt.org>, "VDSM Project Development" <vdsm-devel@lists.fedorahosted.org> Sent: Wednesday, August 7, 2013 1:30:54 PM Subject: Re: [vdsm] How to handle qemu 1.3 dep for Gluster Storage Domain

On 08/07/2013 08:21 AM, Sahina Bose wrote:

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[Adding engine-devel]

On 08/06/2013 10:48 AM, Deepak C Shetty wrote:

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Hi All, There were 2 learnings from BZ https://bugzilla.redhat.com/show_bug.cgi?id=988299

1) Gluster RPM deps were not proper in VDSM when using Gluster Storage Domain. This has been partly addressed by the gluster-devel thread @ http://lists.gnu.org/archive/html/gluster-devel/2013-08/msg00008.html and will be fully addressed once Gluster folks ensure their packaging is friendly enuf for VDSM to consume just the needed bits. Once that happens, i will be sending a patch to vdsm.spec.in to update the gluster deps correctly. So this issue gets addressed in near term.

2) Gluster storage domain needs minimum libvirt 1.0.1 and qemu 1.3.

libvirt 1.0.1 has the support for representing gluster as a network block device and qemu 1.3 has the native support for gluster block backend which supports gluster://... URI way of representing a gluster based file (aka volume/vmdisk in VDSM case). Many distros (incl. centos 6.4 in the BZ) won't have qemu 1.3 in their distro repos! How do we handle this dep in VDSM ?

Do we disable gluster storage domain in oVirt engine if VDSM reports qemu < 1.3 as part of getCapabilities ? or Do we ensure qemu 1.3 is present in ovirt.repo assuming ovirt.repo is always present on VDSM hosts in which case when VDSM gets installed, qemu 1.3 dep in vdsm.spec.in will install qemu 1.3 from the ovirt.repo instead of the distro repo. This means vdsm.spec.in will have qemu >= 1.3 under Requires.

Is this possible to make this a conditional install? That is, only if Storage Domain = GlusterFS in the Data center, the bootstrapping of host will install the qemu 1.3 and dependencies.

(The question still remains as to where the qemu 1.3 rpms will be available)

RHEL6.5 (and so CentOS 6.5) will get backported libgfapi support so we shouldn't need to require qemu 1.3 just the appropriate qemu-kvm version from 6.5 https://bugzilla.redhat.com/show_bug.cgi?id=848070

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hosts are installed prior to storage domain definition usually. we need to find a solution to having a qemu > 1.3 for .el6 (or another version of qemu with this feature set).

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What will be a good way to handle this ? Appreciate your response

thanx, deepak

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