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Hello, menu thanks for your reply.
I tried both post copy and converge but the live migrations is always very
slow for applications servers like tomcat with java.
The very strange behaviour is that if I migrate from compute node A to
compute node B it takes more than 20 minutes.
After that, if I migrate from compute B to compute A, it takes few seconds.
I do not know if its is because dirty memory iscleaned during the first
live migration.
Live migration network si 10Gbs so I do not think the first live migration
is affected by network performances.
Ignazio

Il giorno gio 4 ago 2022 alle ore 11:34 Fabian Zimmermann <dev.faz at gmail.com>
ha scritto:

> Hi,
>
> take a look at:
>
> https://docs.openstack.org/nova/latest/admin/configuring-migrations.html#advanced-configuration-for-kvm-and-qemu
>
> esp. Auto-convergence and Post-copy
>
>  Fabian
>
> Am Mi., 3. Aug. 2022 um 12:43 Uhr schrieb Ignazio Cassano
> <ignaziocassano at gmail.com>:
> >
> > Hello All,
> > I am looking for a solution to speed up live migration.
> > Instances where ram is used heavily like java application servers, live
> migration take a long time (more than 20 minutes for 8GB ram instance) and
> converge mode is already set to True in nova.conf.
> > I also tried with post_copy but it does not change.
> > After the first live migration (very solow) if I try to migrate again it
> is very fast.
> > I presume the first migration is slow because memory fragmentation when
> an instance is running on the same compute node for a long time.
> > I am looking for a solution considering the on my computing node I can
> have
> > a little ram overcommit. Any case I am increasing the number of compute
> nodes to reduce it.
> > Thanks
> > Ignazio
> >
>
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