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Hello Sean, you are right.
Setting cinder nfs it works fine and we do not need do share /var/lib/nova.
Probably there was some errors in my previous installation.
Ignazio

Il giorno mar 22 giu 2021 alle ore 14:32 Sean Mooney <smooney at redhat.com>
ha scritto:

> On Tue, 2021-06-22 at 13:57 +0200, Ignazio Cassano wrote:
> > Hello , I am using cinder with netapp driver but if I do not mount a
> > share
> > under /var/lib/docker/volumes/nova_compute/_data live migration does
> > not
> > work because an error is disblayed: shared storage in needes or
> > something
> > like that.
> > I do not understand why is does not notice that volumes are shared
>
> so these are cinder boot form volume guests?
> if you are usign the correct microverion it should detect that its
> shared storage automaticaly when you do a migration can you confirm the
> command you are usign to do the migration and that its a boot form
> volumen guest not an image backed guest with a data volumn.
> >
> > Ignazio
> >
> > Il giorno mar 22 giu 2021 alle ore 13:43 Sean Mooney <
> > smooney at redhat.com>
> > ha scritto:
> >
> > > On Tue, 2021-06-22 at 13:02 +0200, Radosław Piliszek wrote:
> > > > Hello Ignazio,
> > > >
> > > > If you are not using Cinder NFS backend already, you need to set:
> > > >
> > > >   enable_shared_var_lib_nova_mnt: yes
> > > >
> > > > And yes, you need to manage fstab yourself, mounting the shared
> > > > nfs
> > > > at
> > > > /var/lib/nova/mnt
> > > >
> > > > It must happen before the containers are started (so before
> > > > deploy or
> > > > redeploy).
> > > i dont think they were refering to cinder nfs.
> > > we have support for deploying novas state directory and libvirts
> > > stroage on nfs in nvoa when usign the raw/qcow image backend.
> > >
> > > in general i advise against that but it is supported.
> > > you should ensure that you use nfs v4 preferable nfs v4.2 or newer
> > >
> > > with my downstream hat on we droped supprot for nfs v3 many years
> > > ago
> > > and the last lts release we hadd that supported it was based on
> > > newton.
> > > technially we dont have a min nfs version requirement ustream but
> > > at
> > > some point i think we shoudl enforce at least nfs v4 upstream too.
> > > there are several known locking issues with nfs v3 that make it
> > > generally problematic to use at scale with nova that manifest
> > > intermietnly during move operations.
> > >
> > > the same may or may not be true with nfs via cinder but that is one
> > > of
> > > the less well tested and hardened cinder backends to use with nova.
> > >
> > >
> > > >
> > > > -yoctozepto
> > > >
> > > > On Tue, Jun 22, 2021 at 12:11 PM Ignazio Cassano
> > > > <ignaziocassano at gmail.com> wrote:
> > > > >
> > > > > Hello Stackers, is there any configuration parameter in kolla
> > > > > for
> > > > > sharing nova on nfs between compute nodes ? Or I must insert an
> > > > > entry in fstab ?
> > > > > Thanks
> > > > > Ignazio
> > > > >
> > > >
> > >
> > >
> > >
>
>
>
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