09-15-2008
Final Report:
Origin: Hub fried, moved ethernet from hub to switch. Both are 10/100 autonegotiating
Symptom: I can mount nfs file system to any mount point on the machine EXCEPT the mount point it needs to be on and see the file system as it should be. When I mount to that correct mount point, the machine hangs when I try to list files or perform any other action within that file system.
Initial response: I looked into many red herrings, but the one that brought success was increasing timeo to 250. When I did that, I could perform any tasks I needed to in that file system.
Probable Cause: My suspicion is that the 10/100 autonegotiation did not occur correctly, slowing down nfs communication between the file server and client. When I mounted on a mount point that did not connect to the service it needed to connect to, the load was light and I was able to do most things with it. When on the proper mount point, the load was sufficient to overload the ethernet connection and cause nfs timeouts.
Corrective Action: Disable autonegotiation and set both sides to 100 duplex.
Mike
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LEARN ABOUT SUSE
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.
mount.nfs4 is used for mounting NFSv4 file system, while mount.nfs is used to mount NFS file systems versions 3 or 2. 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.
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)