[PlanetCCRMA] NFS client trouble with my ccrma box
Fernando Lopez-Lezcano
nando at ccrma.Stanford.EDU
Tue Mar 15 10:12:01 PST 2005
On Mon, 2005-03-14 at 17:33, Chris Synan wrote:
> Hi,
>
> I have a debian server with NFS share, and two FC3 clients, one
> vanilla FC3 and one ccrma. I keep both relatively up to date, i
> probably update each box weekly.
>
> On the vanilla box I have no problems accessing the share.
>
> On the ccrma box I am having a lot of problems accessing the share.
>
> The cat5 running between these machine is probably not over 20 yards,
> and I can always ping the server fine from either box.
>
> Sometimes I transfer large files from my ccrma box onto the share. It
> is not typical that these files are >4 GB. Sometimes I leave the
> share mounted for long periods of time with files open or terminal
> window open.
>
> The problem arises when the terminal window quits responding to
> requests to access that share. If I perform 'umount /mnt/pubshare -f'
> it just says "device or resource busy" or something to that effect,
> and I am unable to unmount the share. There are no open apps that I
> can see that are using part of the mounted resource, and I am not in
> that directory when I try to unmount. If I perform 'fuser -v
> /mnt/pubshare' it hangs. At that point, running 'umount' from a
> different terminal will release the hang, but it will complain of
> Input/output error rather than giving me result of fuser, and it still
> will not let me umount.
Do you see anything pertinent to nfs in the output of dmesg or in
/var/log/messages after this happens?
> Meanwhile from the other FC3 box the NFS share is responding just
> fine.
>
> Any ideas? Is there anything about the ccrma setup that should make
> this situation different from my vanilla FC3?
Yes, of course, the kernel. I presume there is some bug in the newer
kernels that shows up in nfs, this could be in the standard kernel or in
the realtime patches that I add.
> Is there some troubleshooting I can do, or some log file that will
> show the problem I am having with the nfs share? if I run nfsstat,
> the output looks normal, even when the box is having the connection
> problem.
>
> The only way out for now is to reboot.
Yuck. See if there are any messages in /var/log/messages that could
point to the origin of the problem.
-- Fernando
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