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Full Discussion: Unusual NFS mount problem on only ONE client: Red Hat WS Rel 3
Top Forums UNIX for Advanced & Expert Users Unusual NFS mount problem on only ONE client: Red Hat WS Rel 3 Post 302277497 by neelpert1 on Friday 16th of January 2009 01:46:41 PM
Old 01-16-2009
Unusual NFS mount problem on only ONE client: Red Hat WS Rel 3
This is an unusual situation where I have an NFS server currently serving out MULTIPLE clients over several variants of Linux and UNIX successfully (world permissions) except for a SINGLE client. Even the other Linux (SuSE) clients in the same room are mounting successfully with defaults without incident. Server and workstation are on the same subnet with NO firewall and (I don't believe) any routers between them. The "traceroute" command shows a single hop directly to the server and nothing in between.

THIS client 'just stopped working' and the only error from the /var/log/messages file indicates that it "could not contact the NFS server: operation timed out."

It all gets fixed if I use 'tcp' as the mount option in /etc/fstab and manually, bypassing UDP altogether. However this client had been working up until this week and AFAIK no changes were made to this client. Again, other Linux clients IN THE SAME ROOM and ON THE SAME SWITCH are doing just fine and not having this problem!

Even the client system itself mounts two other NFS file systems from a different server without this workaround (IRIX server, believe it or not) but cannot mount the SuSE server without using the 'tcp' flag and bypassing udp protocol.

Any clues here? I've googled this particular issue in bug reports but to no avail. Here's the output from the client side of what's being served:

rpcinfo -p hardhead
program vers proto port
100000 2 tcp 111 portmapper
100000 2 udp 111 portmapper
390436 1 tcp 9907
390435 1 tcp 9890
390113 1 tcp 7937
390115 1 tcp 8494
100024 1 udp 32771 status
100021 1 udp 32771 nlockmgr
100021 3 udp 32771 nlockmgr
100021 4 udp 32771 nlockmgr
100024 1 tcp 42410 status
100021 1 tcp 42410 nlockmgr
100021 3 tcp 42410 nlockmgr
100021 4 tcp 42410 nlockmgr
390103 2 tcp 9801
390109 2 tcp 9801
390110 1 tcp 9801
390120 1 tcp 9801
390109 2 udp 9715
391060 1 tcp 850
390107 5 tcp 9289
390107 6 tcp 9289
390402 1 tcp 9011
390105 5 tcp 9164
390105 6 tcp 9164
390433 1 tcp 9598
100003 2 udp 2049 nfs
100003 3 udp 2049 nfs
100003 2 tcp 2049 nfs
100003 3 tcp 2049 nfs
100005 1 udp 805 mountd
100005 1 tcp 806 mountd
100005 2 udp 805 mountd
100005 2 tcp 806 mountd
100005 3 udp 805 mountd
100005 3 tcp 806 mountd
391029 1 tcp 46557
391030 1 tcp 54937
390104 105 tcp 9420
390430 1 tcp 8334
390429 101 tcp 9183

As you can see, NFS is available on both udp and tcp versions 2 and 3.
 

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LEARN ABOUT DEBIAN

mount.nfs

MOUNT.NFS(8)						      System Manager's Manual						      MOUNT.NFS(8)

NAME

       mount.nfs, mount.nfs4 - mount a Network File System

SYNOPSIS

       mount.nfs remotetarget dir [-rvVwfnsh ] [-o options]

DESCRIPTION

       mount.nfs is a part of nfs(5) utilities package, which provides NFS client functionality.

       mount.nfs  is  meant to be used by the mount(8) command for mounting NFS shares. This subcommand, however, can also be used as a standalone
       command with limited functionality.

       remotetarget is a server share usually in the form of servername:/path/to/share.  dir is the directory on which the file system	is  to	be
       mounted.

       Under  Linux  2.6.32  and  later  kernel  versions, mount.nfs can mount all NFS file system versions.  Under earlier Linux kernel versions,
       mount.nfs4 must be used for mounting NFSv4 file systems while mount.nfs must be used for NFSv3 and v2.

OPTIONS

       -r     Mount file system readonly.

       -v     Be verbose.

       -V     Print version.

       -w     Mount file system read-write.

       -f     Fake mount. Don't actually call the mount system call.

       -n     Do not update /etc/mtab.	By default, an entry is created in /etc/mtab for every mounted file system. Use this option to skip making
	      an entry.

       -s     Tolerate sloppy mount options rather than fail.

       -h     Print help message.

       nfsoptions
	      Refer to nfs(5) or mount(8) manual pages.

NOTE

       For further information please refer nfs(5) and mount(8) manual pages.

FILES

       /etc/fstab	 file system table

       /etc/mtab	 table of mounted file systems

SEE ALSO

       nfs(5), mount(8),

AUTHOR

       Amit Gud <agud@redhat.com>

								    5 Jun 2006							      MOUNT.NFS(8)
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