[ovirt-users] massive simultaneous vms migrations ?

Thu Apr 20 11:01:04 UTC 2017

> I did find this parameter (only) in /etc/vdsm/vdsm.conf.rpmnew (??)

.rpmnew files are telling you that RPM could not update the configuration
file automatically during package upgrade, because there was a manual
change in it. You can use a tool like rpmconf or just copy it over
vdsm.conf if you want the defaults.

See for example:

https://ask.fedoraproject.org/en/question/25722/what-are-rpmnew-files/
https://www.redhat.com/archives/rhl-list/2003-December/msg04713.html

Best regards

--
Martin Sivak
SLA / oVirt

On Wed, Apr 19, 2017 at 11:14 AM, Nelson Lameiras <
nelson.lameiras at lyra-network.com> wrote:

> hello pavel,
>
> Thanks for you answer.
> I did find this parameter (only) in /etc/vdsm/vdsm.conf.rpmnew (??)
>
> Parameter is commented with value 2 so my guess is that it is not used...
> So this brings a few more questions :
>
> - Since parameter is commented, default value must be used... can we be
> sure that 2 is default value?
> I do found strange that migrations are limited to 2, I have the feeling
> that more than two are simultaneously being migrated (but I'm maybe wrong),
> how to be sure?
>
> cordialement, regards,
>
> <https://www.lyra-network.com/>
> Nelson LAMEIRAS
> Ingénieur Systèmes et Réseaux / Systems and Networks engineer
> Tel: +33 5 32 09 09 70 <+33%205%2032%2009%2009%2070>
> nelson.lameiras at lyra-network.com
> www.lyra-network.com | www.payzen.eu <https://payzen.eu>
> <https://www.youtube.com/channel/UCrVl1CO_Jlu3KbiRH-tQ_vA>
> <https://www.linkedin.com/company/lyra-network_2>
> <https://twitter.com/LyraNetwork>
> <https://payzen.eu>
> ------------------------------
> Lyra Network, 109 rue de l'innovation, 31670 Labège, FRANCE
>
>
> ------------------------------
> *From: *"Pavel Gashev" <Pax at acronis.com>
> *To: *users at ovirt.org, "nelson lameiras" <nelson.lameiras at lyra-network.com
> >
> *Sent: *Tuesday, April 18, 2017 7:16:08 PM
> *Subject: *Re: [ovirt-users] massive simultaneous vms migrations ?
>
> VDSM has the following config option:
>
> # Maximum concurrent outgoing migrations
> # max_outgoing_migrations = 2
>
> On Tue, 2017-04-18 at 18:48 +0200, Nelson Lameiras wrote:
>
> hello,
>
> When putting a host on "maintenance mode", all vms start migrating to
> other hosts.
>
> We have some hosts that have 60 vms. So this will create a 60 vms
> migrating simultaneously.
> Some vms are under so much heavy loads that migration fails often (our
> guess is that massive simultaneous migrations does not help migration
> convergence) - even with "suspend workload if needed" migraton policy.
>
> - Does oVirt really launches 60 simultaneous migrations or is there a
> queuing system ?
> - If there is a queuing system, is there a way to configure a maximum
> number of simultaneous migrations ?
>
> I did see a "migration bandwidth limit", but this is quite what we are
> looking for.
>
> my setup:
> ovirt-engine +hosted engine 4.1.1
> hosts : centos 7.3 fully updated.
>
> for full context to understand this question : 2 times in the past, when
> trying to put a host in maintenance, host stopped responding during massive
> migrations and was fenced by engine. It's still unclear why host stopped
> responding, but we think that migrating 60+ vms simultaneously puts a heavy
> strain on storage ? So we would like to better control migration process in
> order to better understand what's happening. This scenario is "production
> only" since our labs do not contain nearly as much vm with such heavy
> loads. So rather than trying to reproduce, we are trying to avoid ;)
>
> cordialement, regards,
>
> <https://www.lyra-network.com/>
> Nelson LAMEIRAS
> Ingénieur Systèmes et Réseaux / Systems and Networks engineer
> Tel: +33 5 32 09 09 70 <+33%205%2032%2009%2009%2070>
> nelson.lameiras at lyra-network.com
> www.lyra-network.com | www.payzen.eu <https://payzen.eu>
> <https://www.youtube.com/channel/UCrVl1CO_Jlu3KbiRH-tQ_vA>
> <https://www.linkedin.com/company/lyra-network_2>
> <https://twitter.com/LyraNetwork>
> <https://payzen.eu>
> ------------------------------
> Lyra Network, 109 rue de l'innovation, 31670 Labège, FRANCE
>
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>
>
>
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