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From Andrija Panic <andrija.pa...@gmail.com>
Subject Re: CPU live migration question
Date Tue, 19 Feb 2019 15:09:53 GMT
Protip: don't restart via ACS Restart VM button (since identical XML will
be used as before) - do full stop /start cycle.

On Tue, Feb 19, 2019, 15:24 Ivan Kudryavtsev <kudryavtsev_ia@bw-sw.com
wrote:

> The only problem is with live migration and when cpu frequency is set to
> the highest rate possible, while new cpu has lower rate.
>
> Other problem is when passthrough is set and cpus belong to various
> families like x5600 and E5-2600 V4. Then you should avoid passthrough and
> set in agent config lowest possible cpu among all cluster hosts. Next,
> restart agents and restart every VM to get new cpu model.
>
> вт, 19 февр. 2019 г., 8:40 Ugo Vasi ugo.vasi@procne.it.invalid:
>
>> Hi Andrija,
>> is it possible to change agent.properties "on fly"?
>>
>> Il 19/02/19 12:59, Andrija Panic ha scritto:
>> > Ugo,
>> >
>> > as long as the CPU flags are same or newer than the existing hosts in
>> > cluster, it's 100% safe operation in regards to live migrations.
>> >
>> > But as Piotr said, if you are using some level of emulation of CPU model
>> > (versus hos-passthrough), then you might be good even with slighly older
>> > CPU on this new hosts that you want to add to a cluster.
>> >
>> > Do some reading around libvirt CPU model and simply just add one host
>> and
>> > test live migration - as simple as that.
>> >
>> > Kind regards,
>> >
>> > Andrija
>> >
>> > On Tue, 19 Feb 2019 at 12:39, Piotr Pisz <piotr@piszki.pl> wrote:
>> >
>> >> Hi Ugo,
>> >>
>> >> [root@cstack-1 ~]# cat /etc/cloudstack/agent/agent.properties  |grep
>> passt
>> >> guest.cpu.mode=host-passthrough
>> >>
>> >> The CPU model determines everything, if you have a passthrough it will
>> be
>> >> difficult or not possible.
>> >> But if you have emulated it is no problem (eg you set up SandyBridge
>> >> everywhere).
>> >>
>> >> Regards,
>> >> Piotr
>> >>
>> >>
>> >> -----Original Message-----
>> >> From: Ugo Vasi <ugo.vasi@procne.it.INVALID>
>> >> Sent: Tuesday, February 19, 2019 12:27 PM
>> >> To: users@cloudstack.apache.org
>> >> Subject: CPU live migration question
>> >>
>> >> Hi all,
>> >> I would like to know if it is possible to add to an existing cluster a
>> host
>> >> that has the cpu different from that of the pre-existing hosts or which
>> >> features must be the same.
>> >>
>> >> I have read around that there may be problems at the libvirt level but
>> it
>> >> is
>> >> not clear to me which parameters must match.
>> >>
>> >> Thanks
>> >> --
>> >>
>> >> *Ugo Vasi* / System Administrator
>> >> ugo.vasi@procne.it <mailto:ugo.vasi@procne.it>
>> >>
>> >>
>> >>
>> >>
>> >> *Procne S.r.l.*
>> >> +39 0432 486 523
>> >> via Cotonificio, 45
>> >> 33010 Tavagnacco (UD)
>> >> www.procne.it <http://www.procne.it/>
>> >>
>> >>
>> >> Le informazioni contenute nella presente comunicazione ed i relativi
>> >> allegati possono essere riservate e sono, comunque, destinate
>> >> esclusivamente
>> >> alle persone od alla Società sopraindicati. La diffusione,
>> distribuzione
>> >> e/o
>> >> copiatura del documento trasmesso da parte di qualsiasi soggetto
>> diverso
>> >> dal
>> >> destinatario è proibita sia ai sensi dell'art. 616 c.p., che ai sensi
>> del
>> >> Decreto Legislativo n. 196/2003 "Codice in materia di protezione dei
>> dati
>> >> personali". Se avete ricevuto questo messaggio per errore, vi
>> preghiamo di
>> >> distruggerlo e di informare immediatamente Procne S.r.l. scrivendo all'
>> >> indirizzo e-mail info@procne.it <mailto:info@procne.it>.
>> >>
>> >>
>> >>
>>
>>
>> --
>>
>> *Ugo Vasi* / System Administrator
>> ugo.vasi@procne.it <mailto:ugo.vasi@procne.it>
>>
>>
>>
>>
>> *Procne S.r.l.*
>> +39 0432 486 523
>> via Cotonificio, 45
>> 33010 Tavagnacco (UD)
>> www.procne.it <http://www.procne.it/>
>>
>>
>> Le informazioni contenute nella presente comunicazione ed i relativi
>> allegati possono essere riservate e sono, comunque, destinate
>> esclusivamente alle persone od alla Società sopraindicati. La
>> diffusione, distribuzione e/o copiatura del documento trasmesso da parte
>> di qualsiasi soggetto diverso dal destinatario è proibita sia ai sensi
>> dell'art. 616 c.p., che ai sensi del Decreto Legislativo n. 196/2003
>> "Codice in materia di protezione dei dati personali". Se avete ricevuto
>> questo messaggio per errore, vi preghiamo di distruggerlo e di informare
>> immediatamente Procne S.r.l. scrivendo all' indirizzo e-mail
>> info@procne.it <mailto:info@procne.it>.
>>
>>

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