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There is compute_nodes file in /var/lib/nova/instances with the hostnames of all compute nodes using that storage so it should be possible and easy to figure out if that is a shared storage or not. 

Regards, 
Daniel 

----- Original Message -----

> From: "Razique Mahroua" <razique.mahroua at gmail.com>
> To: "Chris Friesen" <chris.friesen at windriver.com>,
> openstack at lists.openstack.org
> Sent: Thursday, November 7, 2013 1:53:29 PM
> Subject: Re: [Openstack] Is there a way to tell Nova not to count
> NFS-mounted instances directory to disk space on each node?

> I think during the migrations, the compute topic already checks
> whether or not the storage is a shared one

> --
> Razique

> On 7 Nov 2013 at 10:11:24, Chris Friesen (
> chris.friesen at windriver.com ) wrote:
> > I think it would make sense to have an entry in the nova.conf file
> > on
> > a
> 
> > compute node to indicate that the instances are mounted on shared
> > storage.
> 

> > This could be fed back into the database, used in resource
> > reporting
> 
> > (like in this case where it affects the "real" amount of storage
> 
> > available), and could also be added to the instance itself so that
> > the
> 
> > evacuate/migrate commands could programmatically determine whether
> > the
> 
> > instance is on shared storage or not instead of requiring the user
> > to
> 
> > specify it.
> 

> > Chris
> 

> > On 11/07/2013 04:36 AM, Razique Mahroua wrote:
> 
> > > Hey Daniel,
> 
> > >
> 
> > > Doesn’t seem possible at the moment looks like...
> 
> > > --
> 
> > > Razique
> 
> > >
> 
> > > On 7 Nov 2013 at 02:09:15, Daniel Speichert (daniel at speichert.pl
> 
> > > <mailto://daniel@speichert.pl>) wrote:
> 
> > >
> 
> > >> Hi All,
> 
> > >>
> 
> > >> We have a couple of compute nodes each having its
> 
> > >> /var/lib/nova/instances directory mounted via NFS from shared
> > >> storage
> 
> > >> server.
> 
> > >> Nova gathers free space statistics from each compute node and
> > >> adds
> 
> > >> them, making the theoretical total disk space equal N times the
> > >> real
> 
> > >> one (N is the number of nodes we have).
> 
> > >> Is there a way to tell it not to count this space again on some
> > >> nodes?
> 
> > >>
> 
> > >> Regards,
> 
> > >> Daniel Speichert
> 
> > >>
> 
> > >>
> 
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> 
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> > >
> 
> > >
> 
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> 

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