[Lustre-discuss] Samba and file locking

[David Noriega]

No, we will only have a single samba server sharing out lustre-backed
files. What do you mean in a way similar to samba? What does samba do
that is different? We are using lustre to replace our old nfs server
for serving up home directories in our cluster and the rest of our
systems.

On Fri, Aug 27, 2010 at 6:15 PM, Oleg Drokin <oleg.drokin at oracle.com> wrote:
> Hello!
>
> On Aug 27, 2010, at 6:41 PM, David Noriega wrote:
>> But I also found out about the flock option for lustre. Should I set
>> flock on all clients? or can I just use localflock option on the
>> fileserver?
>
> It depends.
> If you are 100% sure none of your other clients use flocks in a way similar to samba to
> guard their file accesses AND you don't export (same fs with) samba from more than one node, you
> can mount with localflock on samba-exporting node.
>
> Otherwise you need to mount with flock, but please be aware that flock is not exactly cheap in lustre,
> every flock operation is a synchronous RPC plus it puts even more load on MDS and some applications
> start to use flock once they see it as available resulting in possible unexpected slowdowns
> (MPI apps in some IO modes without lustre ADIO driver tend to do this, I think)
>
> Bye,
>    Oleg



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