Solution: downgrade to woody for nfs-utils:

As I mentioned earlier:

On our file server, AMD Opteron(tm) Processor 852, running Sarge, we have
something like 300 clients (PCs on Debian Sarge and Xterminals, based
on Sarge servers) and ~ 1000 users. 

When under big load, the rpc.mountd from sarge becomes unresponsive:
As top shows, its %CPU then switches between more than 95% and
something like 60%, and it won't give any answer anymore until it is
rebooted. (/etc/init.d/nfs-kernel-server restart won't help.)

Apparently, this happens already, when the server gets a mount request
every two seconds. (I am not sure how many requests it is supposed to
handle.) However, we never observed a segfault of rpc.mountd. I should
mention that under testing conditions with few users (up to 10 or so)
or under little load, the sarge system worked quite well.

After downgrading both nfs-common and nfs-kernel-server (version
1:1.0.6-3.1, from sarge) to version 1:1.0-2woody3 from woody the
rpc.mountd worked well (though not very fast under big load).

Downgrading just nfs-kernel-server (which contains the rpc.mountd
program) seemed to work at first glance, but developed a lot of stale
file handles after a couple of hours, so we also had to downgrade
nfs-common (which belongs to the same software package nfs-utils) in
order to obtain a stable system.

Ulf Rehmann







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