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Date:      Tue, 2 Jun 2009 20:57:06 +0100 (BST)
From:      Robert Watson <rwatson@FreeBSD.org>
To:        Rick Macklem <rmacklem@uoguelph.ca>
Cc:        freebsd-current@FreeBSD.org, "O. Hartmann" <ohartman@zedat.fu-berlin.de>
Subject:   Re: RPCPROG_MNT: RPC: Timed out / receiving NFS error when trying to mount NFS file system after make world
Message-ID:  <alpine.BSF.2.00.0906022053170.52806@fledge.watson.org>
In-Reply-To: <Pine.GSO.4.63.0906021146470.19159@muncher.cs.uoguelph.ca>
References:  <4A2504AA.1020406@zedat.fu-berlin.de> <Pine.GSO.4.63.0906021030500.6192@muncher.cs.uoguelph.ca> <4A254194.7080807@zedat.fu-berlin.de> <Pine.GSO.4.63.0906021146470.19159@muncher.cs.uoguelph.ca>

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On Tue, 2 Jun 2009, Rick Macklem wrote:

>> Mounting via '-o nfsv3,tcp' in addition, everthing works all right again. I 
>> do not know why udp is invoked automatically by now.
>> 
>> But for short, we always did NFS mounts over tcp AND udp, so for tcp it 
>> worked again!
>> 
> Hmm, weird. udp mounts work here for me (except NFSv4, where tcp is 
> required, but you'd only get that if you had used "-o nfsv4" in your mount).
>
> I'll take another look at mount_nfs.c too (already caught a problem I 
> introduced in mountd.c). Maybe I unintentionally changed one of the 
> defaults. (I think the default is supposed to be nfsv3,tcp but I'll look.)

I'm running into a similar-sounding but odd problem on a diskless NFS client 
test box running 8.0, but talking to a server running 7.0:

cheetah# mount -o rw -u /
[udp] zoo:/zoo/cheetah: RPCPROG_NFS: RPC: Port mapper failure - RPC: Unable to 
send

If I do a fresh file system mount it works fine:

cheetah# mount 192.168.5.1:/zoo /zoo
cheetah# mount
192.168.5.1:/zoo/cheetah on / (nfs, read-only)
devfs on /dev (devfs, local)
/dev/md0 on /var (ufs, local)
/dev/md1 on /tmp (ufs, local)
192.168.5.1:/zoo on /zoo (nfs)

This is with an approximately 26 May userspace.

Robert N M Watson
Computer Laboratory
University of Cambridge


>
> For udp to work, nfsd must have the "-u" argument. That might be why it
> wouldn't work? (Still doesn't explain why the default was udp and not
> tcp.)
>
> Anyhow, thanks for doing the testing and I'll email again if I find
> that I've screwed up the defaults for mount_nfs too. (Is that a
> "big pointy hat"?:-)
>
> rick
>
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