[Samba] Samba with CTDB able to serve non-clustered data?

[Alexandre]

Hi,

Le 11 août 2016 22:04, "Martin Schwenke via samba" <samba at lists.samba.org>
a écrit :
>
> Hi Steve,
>
> On Thu, 11 Aug 2016 14:46:53 -0400, Stephen Cousins via samba
> <samba at lists.samba.org> wrote:
>
> > Thanks very much for the information.
> >
> > I guess the part:
> >
> > * Coherency of the file data you serve with Samba
> >
> >   You need to make sure that updates to the data that you are serving
> >   are seen coherently across the cluster.
> >
> > Is the tough one. Is there a way to do this that you know of when using
NFS?
>
> I don't have the NFS expertise to answer this.  Hopefully someone else
> will step in with an answer...
>

Although I wouldn't call myself an NFS expert, I already had to deal
similar setups.

NFS differs largely from distributed filesystem. It is a shared fs. Its
different nature makes consistency consideration less relevant than for
distributed filesystems.
Having said that, there are a couple of options you should set carefully.
Some on the NFS server, some others on the NFS client (here your samba
server).

- NFS Server options:
  > use synchronous exports (sync)

- NFS Clients options:
  > disable client cache when mounting the export (noac)
  > disable locks at Mount time (nolock)

Please note that the options above aim at providing reliable and consistent
data. They also have a performance impact and you should test how bad it
impacts your setup. This is a matter of trade-off.

Generally speaking, I wouldn't recommend re-sharing NFS exports. I always
had unexpected behaviors in this setup. Nfs not being posix compliant, be
prepared for some weird stuffs.

Regards.

> > I see version 4.5 RC2 was just released. Do you know when it will be
fully
> > released?
>
> The current plan is first half of September:
>
>   https://wiki.samba.org/index.php/Release_Planning_for_Samba_4.5
>
> peace & happiness,
> martin
>
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