Re: [PATCH 1/2] manpage: Add a description of the 'nconnect' mount option

[Trond Myklebust <trondmy@hammerspace.com>]

On Tue, 2020-02-04 at 11:46 -0500, Steve Dickson wrote:
> Trond,
> 
> On 2/3/20 10:15 AM, Olga Kornievskaia wrote:
> > Looks good but can we add clarification that nconnect is supported
> > for
> > 3.0 and 4.1+?
> Do you have an opinion on this? Should we document the protocols that
> are supported?

Unless there is an actual protocol reason for doing so, I'd rather not
that we be on the record as saying that NFSv4.0 will remain
unsupported.
In other words, I'd like us to keep open the possibility that we might
add NFSv4.0 support in the future, should someone need it.

Cheers
  Trond


> steved.
> 
> > On Wed, Jan 29, 2020 at 10:47 AM Steve Dickson <steved@redhat.com>
> > wrote:
> > > From: Trond Myklebust <trond.myklebust@hammerspace.com>
> > > 
> > > Add a description of the 'nconnect' mount option on the 'nfs'
> > > generic
> > > manpage.
> > > 
> > > Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
> > > Signed-off-by: Steve Dickson <steved@redhat.com>
> > > ---
> > >  utils/mount/nfs.man | 17 +++++++++++++++++
> > >  1 file changed, 17 insertions(+)
> > > 
> > > diff --git a/utils/mount/nfs.man b/utils/mount/nfs.man
> > > index 6ba9cef..84462cd 100644
> > > --- a/utils/mount/nfs.man
> > > +++ b/utils/mount/nfs.man
> > > @@ -369,6 +369,23 @@ using an automounter (refer to
> > >  .BR automount (8)
> > >  for details).
> > >  .TP 1.5i
> > > +.BR nconnect= n
> > > +When using a connection oriented protocol such as TCP, it may
> > > +sometimes be advantageous to set up multiple connections between
> > > +the client and server. For instance, if your clients and/or
> > > servers
> > > +are equipped with multiple network interface cards (NICs), using
> > > multiple
> > > +connections to spread the load may improve overall performance.
> > > +In such cases, the
> > > +.BR nconnect
> > > +option allows the user to specify the number of connections
> > > +that should be established between the client and server up to
> > > +a limit of 16.
> > > +.IP
> > > +Note that the
> > > +.BR nconnect
> > > +option may also be used by some pNFS drivers to decide how many
> > > +connections to set up to the data servers.
> > > +.TP 1.5i
> > >  .BR rdirplus " / " nordirplus
> > >  Selects whether to use NFS v3 or v4 READDIRPLUS requests.
> > >  If this option is not specified, the NFS client uses READDIRPLUS
> > > requests
> > > --
> > > 2.21.1
> > > 
-- 
Trond Myklebust
Linux NFS client maintainer, Hammerspace
trond.myklebust@hammerspace.com