From: Trond Myklebust <trond.myklebust@fys.uio.no>
Subject: Re: Status of mount.nfs
Date: Fri, 27 Jul 2007 12:27:59 -0400
Message-ID: <1185553679.6586.34.camel@localhost>
References: <20070708191640.GA13962@uio.no>
	<18065.43199.104020.412029@notabene.brown>	<20070715083114.GB4158@uio.no>
	<18074.50730.591965.39211@notabene.brown>	<20070716092047.GA10353@uio.no>
	<18075.17719.855332.259470@notabene.brown>	<20070722191733.GA31501@uio.no>
	<46A52816.6050500@oracle.com>	<20070724172451.GA14026@uio.no>
	<46A7A5F8.4040204@oracle.com> <46A897CD.50201@RedHat.com>
	<46A96032.7080503@oracle.com>  <46AA089E.50503@RedHat.com>
	<1185551769.6586.28.camel@localhost>  <46AA1A70.5010705@RedHat.com>
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Cc: nfs@lists.sourceforge.net
To: Steve Dickson <SteveD@redhat.com>
In-Reply-To: <46AA1A70.5010705@RedHat.com>
Sender: nfs-bounces@lists.sourceforge.net
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On Fri, 2007-07-27 at 12:16 -0400, Steve Dickson wrote:
> 
> Trond Myklebust wrote:
> > On Fri, 2007-07-27 at 11:00 -0400, Steve Dickson wrote:
> > 
> >> That was the main reason for the ping. Since neither portmapper or
> >> rpcbind ping their services before they hand out the ports, there
> >> is really no way of telling where the server is up? So to avoid
> >> the hang, we ping them... Sure its costly network wise, but
> >> hanging during a boot because a server is not responding is
> >> a bit more costly... imho...
> > 
> > Right, but recent kernels both can and will ping the NFS service for
> > you.
> Good point... but that's just as costly (wrt network traffic) as
> the mount command doing the pinging... plus the status of the
> remote mountd is also needed.

The kernel ping is sent on the same connection to the server than the
NFS client will use, so we don't waste any extra TCP ports.

I agree that you need to figure out the mountd parameters, but the right
thing to do there is simply to try the command. The RPC return values
will tell you if the service or version you tried isn't supported.

Cheers
  Trond


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