[ovirt-users] hot plug memory in el7

Wed Dec 9 21:21:10 UTC 2015

On Wed, Dec 9, 2015 at 8:04 PM, Michal Skrivanek <mskrivan at redhat.com>
wrote:

>
>
> On 09 Dec 2015, at 18:07, Nathanaël Blanchet <blanchet at abes.fr> wrote:
>
>
>
> Le 09/12/2015 18:00, Michal Skrivanek a écrit :
>
>
> On 09 Dec 2015, at 17:54, Nathanaël Blanchet <blanchet at abes.fr> wrote:
>
>
>
> Le 09/12/2015 17:12, Michal Skrivanek a écrit :
>
>
> On 09 Dec 2015, at 14:54, Nathanaël Blanchet <blanchet at abes.fr> wrote:
>
>
>
> Le 08/12/2015 11:43, Michal Skrivanek a écrit :
>
>
>
> On 08 Dec 2015, at 11:20, Yaniv Dary < <ydary at redhat.com>ydary at redhat.com>
> wrote:
>
>
>
> Yaniv Dary
> Technical Product Manager
> Red Hat Israel Ltd.
> 34 Jerusalem Road
> Building A, 4th floor
> Ra'anana, Israel 4350109
>
> Tel : +972 (9) 7692306
>         8272306
> Email: ydary at redhat.com
> IRC : ydary
>
>
> On Tue, Dec 8, 2015 at 2:03 AM, Nathanaël Blanchet < <blanchet at abes.fr>
> blanchet at abes.fr> wrote:
>
>> Hi all,
>>
>> I may miss something but according to
>> http://www.ovirt.org/Features/Hot_Plug_Memory, ovirt 3.6 was supposed to
>> support the hot plug memory feature. Nothing happens in reality when
>> increasing memory on a running vm with centos7.
>> I found this :
>> <http://lists.ovirt.orgpipermail/kimchi-devel/2015-June/010714.html>
>> http://lists.ovirt.orgpipermail/kimchi-devel/2015-June/010714.html, and
>> it seems that el7.1 can't support the feature because of its libvirt
>> version (1.2.8) while the required one is 1.2.14.
>> I didn't test, but I guess F22 supports it.
>> Is there any chance that el7.2 would support it with a backported
>> libvirtd?
>>
>
> It does support it, but only hot-plug not hot-unplug.
>
>
>> Or will a dedicated libvirt rhev package be released so as the downstream
>> to support it (like qemu-kvm for live snapshot some time ago)?
>> Documentation and limitation of the libvirt version for hot plug memory
>> are difficult to find in the ovirt wiki and more generally on the web.
>> Maybe the feature has been postponed to a 3.6.z release?
>>
>
> I works with fedora and you can use it currently with this feature.
>
>
> It works on centos too, qemu-kvm-ev 2.3 we distribute in ovirt repo
>
> Hello, no qemu-kvm-ev 2.3 is not enough:
> [root at fuji ~]# qemu-img --version
> qemu-img version 2.3.0 (qemu-kvm-ev-2.3.0-29.1.el7), Copyright (c)
> 2004-2008 Fabrice Bellard
> and
> vdsm-4.17.10.1-0.el7.centos.noarch
>
> I get this error message each time I try to hot add memory :
> Dec  9 11:18:00 fuji journal: unsupported configuration: unknown device
> type ‘memory'
>
>
> was the VM started in a 3.6 cluster?
>
> sure, on a full 3.6 cluster. I stopped/restarted them. I restarted vdsmd
> and libvirtd
>
>
> ok..and just for the sake of completeness - what is libvirt version
> exactly? If you’re running <1.2.14 then your initial comment make a lot of
> sense….
> Yes, el7.2 has the right one (1.2.17) but even on 7.1 it should support it
> and if it doesn’t it’s our problem we should fix in ovirt (similarly as we
> solve qemu by shipping it ourselves)
>
> libvirt-daemon-1.2.8-16.el7_1.5.x86_64
> I'm really surprised that such a waited feature has not been yet tested by
> the community users with el7, so that nobody has reported the issue yet.
>
>
>
the feature has been tested (by me) and bug was already reported (here
https://bugzilla.redhat.com/show_bug.cgi?id=1287994 )

> Weird indeed. Well, RHEL 7.2 is out for more than a month and there is
> centos 7.2 beta and perhaps rc as well, it's due very soon
> Sandro, we should think about it - since we push qemu-kvm-ev we do not
> really enforce anyone to run on el7.2. We want to do that for various
> reasons as soon as possible. Maybe updating qemu-kvm-ev to require new 7.2
> libvirt?
>
>
>
No idea. If it's libvirt issue, can you test
http://cbs.centos.org/koji/buildinfo?buildID=4726 ? it's from centos virt
sig, introduced for Xen but should work on kvm as well. or the 7.2 libvirt
from http://mirror.centos.org/centos/7/cr/x86_64/Packages/.

> Or how/when did you create it?
>
> those vms have been created before uprading to 3.6, some of them from a
> blank template, other one based on a el7 template.
>
>
> Thanks,
> michal
>
>
> I tried to restart vdsmd but it is the same, even on other hosts.
>
> any help will be appreciated, thank you.
>
>
>
>
>> Thank you for your help
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>>
>
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>
> --
> Nathanaël Blanchet
>
> Supervision réseau
> Pôle Infrastrutures Informatiques
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> Tél. 33 (0)4 67 54 84 55
> Fax  33 (0)4 67 54 84 14blanchet at abes.fr
>
>
>
> --
> Nathanaël Blanchet
>
> Supervision réseau
> Pôle Infrastrutures Informatiques
> 227 avenue Professeur-Jean-Louis-Viala
> 34193 MONTPELLIER CEDEX 5 	
> Tél. 33 (0)4 67 54 84 55
> Fax  33 (0)4 67 54 84 14blanchet at abes.fr
>
>
>
> --
> Nathanaël Blanchet
>
> Supervision réseau
> Pôle Infrastrutures Informatiques
> 227 avenue Professeur-Jean-Louis-Viala
> 34193 MONTPELLIER CEDEX 5 	
> Tél. 33 (0)4 67 54 84 55
> Fax  33 (0)4 67 54 84 14blanchet at abes.fr
>
>

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