Re: [Gluster-devel] Fwd: Questions on libgfapi

[Vijay Bellur]

On 09/20/2013 09:03 PM, Muralidhar Balcha wrote:
> Thanks Vijay for quick response.
>
> On a related question if multiple vms are created using qemu GlusterFS
> block driver on the same volume then volume consistency is assured by
> the gluster driver, correct.


Yes, gluster driver in conjunction with other glusterfs components 
provides consistency.

-Vijay

> Murali Balcha
> > *From:* Vijay Bellur <address@hidden <javascript:_e({}, 'cvml',
> > 'address@hidden');>>
> > *Date:* September 20, 2013, 8:58:35 AM EDT
> > *To:* Murali Balcha <address@hidden <javascript:_e({},
> > 'cvml', 'address@hidden');>>
> > *Cc:* "address@hidden <javascript:_e({}, 'cvml',
> > 'address@hidden');>" <address@hidden
> > <javascript:_e({}, 'cvml', 'address@hidden');>>
> > *Subject:* *Re: [Gluster-devel] Questions on libgfapi*
> >
> > On 09/20/2013 06:36 AM, Murali Balcha wrote:
> > > Hi,
> > >
> > > I have couple of questions on libgfapi.
> > >
> > > 1.Can two or more clients on either same host or different hosts access
> > > single volume thru libgfapi?
> >
> > Yes, it is possible.
> >
> > > 2.How do clients synchronize access to files? I believe both clients
> > > have their instance of client side translators loaded, right?
> >
> > Yes, Both clients will have their own instances of client xlators
> > loaded. GlusterFS/libgfapi has support for advisory posix locking and
> > applications can make use of that if multiple application instances
> > need to synchronize access to files. If a replicated gluster volume is
> > used, the afr translator makes use of a transaction framework to
> > synchronize updates and provide consistency.
> >
> > > 3.Does it use lk translator for synchronizing access to files?
> >
> > Yes, the lk translator loaded on the server stack is used for
> > synchronization.
> >
> > Regards,
> > Vijay
>
>
>
> --
> Muralidhar Balcha
> 508 494 5007