Re: [ovirt-users] massive simultaneous vms migrations ?

.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(a)lyra-network.com&gt; wrote: > hello pavel, > > Thanks for you answer. > > 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(a)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(a)acronis.com&gt; > *To: *users(a)ovirt.org, "nelson lameiras" <nelson.lameiras(a)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(a)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 > > _______________________________________________ > Users mailing listUsers@ovirt.orghttp://lists.ovirt.org/mailman/listinfo/users > > > > _______________________________________________ > Users mailing list > Users(a)ovirt.org > http://lists.ovirt.org/mailman/listinfo/users > >