Re: When does NFSv3 client uses FILE_SYNC?

[Oren D <oren01@gmail.com>]

> Le mercredi 10 Novembre 2004 17:05, Oren D a =E9crit :
>=20
>=20
> > Hi all,
> >
> > Can someone please list for me the conditions under which an NFSv3
> > client would send FILE_SYNC write requests?
> >
> > I have the filesystem exported on the server with the sync option
> > (which is not supposed to prevent the client from writing with
> > UNSTABLE),
> > and mounted from the client with the default mount options.
> >
> > And still i have a user-space application that generates WRITEs with
> > FILE_SYNC!
> >
> > This is what I know that can make the client write using FILE_SYNC:
> > - mount -o sync
> > - open(...,O_SYNC)
>=20
> What kernel is it?
> For a 2.6.x one, if the export's sync option is set all request will be
> synchronised, (even if the file is opened async... )
>=20
> (I remember some problems with that... )
>=20
>=20
> Vincent
>=20

Kernels are 2.4 (RH9) both client and server.
I read that the sync export option does not prevent the client (in NFS
v3) from working async.
And i see it for a fact when using simple dd or cp commands. It's only
that specific application generating FILE_SYNC writes on the same
mounted filesystem. It has to be something controlled by a userspace
application. I checked with the authors of the application, and they
say their not using O_SYNC, that's why i'm looking for other options.

Regards,
Oren.


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