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On 04/08, Ignazio Cassano wrote:
> HI,
> I am using cinder volumes.
> Ignazio
>

Hi,

In that case there is no volume data being copied for the instance
migration, and volume attach on the destination should not account for
more than 30 seconds of those 20 minutes, so not much improvement
possible there.

Cheers,
Gorka.

> Il giorno gio 4 ago 2022 alle ore 16:56 Gorka Eguileor <geguileo at redhat.com>
> ha scritto:
>
> > On 03/08, Ignazio Cassano wrote:
> > > 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.
> >
> > Hi,
> >
> > Probably doesn't affect your case, but I assume you are using ephemeral
> > nova boot volumes.
> >
> > Have you tried using only Cinder volumes on the VM?
> >
> > Cheers,
> > Gorka.
> >
> >
> > > 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
> >
> >