Personal guesses, YMMV, YKWYPFI (you know what you paid for it), etc:
If you don’t need NFS, leave it off. When I saw it in there I thought – oh, my. For NFS clients, I know you can freeze a system when the server goes unresponsive. Or I think I know that J
Of all those things, are there any you are NOT using?
Besides the ping test mentioned earlier, I suppose you could start dividing and conquering (turn back on half the items below, run the test. If passes, run the other half to verify that the mix of the other half will fail, THEN split the failing half in half and repeat).
I can’t recall if I’ve ever seen a hung printer hang cups enough to hang the entire system. It will hang printing, of course, but…
In any case, yes it sounds like some sort of hw/sw interaction or maybe just sw.
Good luck, Mr Phelps! ;-)
Rusty
From: plug-discuss-bounces@lists.plug.phoenix.az.us [mailto:plug-discuss-bounces@lists.plug.phoenix.az.us] On Behalf Of Mark Phillips
Sent: Wednesday, June 27, 2012 6:51 AM
To: Main PLUG discussion list
Subject: Re: Strange Server Behavior
Some more pieces to the puzzle...
I ran the same ping test last night (laptop to server), but stopped the following services on the server:
apache2
exim4
mediatomb
mysql
nfs-kernel-server
nfs-common
openvpnas
cups
ntp
rpcbind
And there were no packets lost!
2802 packets transmitted, 2802 received, 0% packet loss, time 28010243ms
rtt min/avg/max/mdev = 0.063/0.157/0.319/0.033 ms
This is all that was running:
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
root 1 0.0 0.0 2036 736 ? Ss Jun25 0:01 init [2]
root 2 0.0 0.0 0 0 ? S Jun25 0:00 [kthreadd]
root 3 0.0 0.0 0 0 ? S Jun25 0:00 [migration/0]
root 4 0.0 0.0 0 0 ? S Jun25 0:00 [ksoftirqd/0]
root 5 0.0 0.0 0 0 ? S Jun25 0:00 [watchdog/0]
root 6 0.0 0.0 0 0 ? S Jun25 0:00 [events/0]
root 7 0.0 0.0 0 0 ? S Jun25 0:00 [cpuset]
root 8 0.0 0.0 0 0 ? S Jun25 0:00 [khelper]
root 9 0.0 0.0 0 0 ? S Jun25 0:00 [netns]
root 10 0.0 0.0 0 0 ? S Jun25 0:00 [async/mgr]
root 11 0.0 0.0 0 0 ? S Jun25 0:00 [pm]
root 12 0.0 0.0 0 0 ? S Jun25 0:00 [sync_supers]
root 13 0.0 0.0 0 0 ? S Jun25 0:00 [bdi-default]
root 14 0.0 0.0 0 0 ? S Jun25 0:00 [kintegrityd/0]
root 15 0.0 0.0 0 0 ? S Jun25 0:00 [kblockd/0]
root 16 0.0 0.0 0 0 ? S Jun25 0:00 [kacpid]
root 17 0.0 0.0 0 0 ? S Jun25 0:00 [kacpi_notify]
root 18 0.0 0.0 0 0 ? S Jun25 0:00 [kacpi_hotplug]
root 19 0.0 0.0 0 0 ? S Jun25 0:00 [kseriod]
root 21 0.0 0.0 0 0 ? S Jun25 0:00 [kondemand/0]
root 22 0.0 0.0 0 0 ? S Jun25 0:00 [khungtaskd]
root 23 0.0 0.0 0 0 ? S Jun25 0:00 [kswapd0]
root 24 0.0 0.0 0 0 ? SN Jun25 0:00 [ksmd]
root 25 0.0 0.0 0 0 ? S Jun25 0:00 [aio/0]
root 26 0.0 0.0 0 0 ? S Jun25 0:00 [crypto/0]
root 154 0.0 0.0 0 0 ? S Jun25 0:00 [ksuspend_usbd]
root 155 0.0 0.0 0 0 ? S Jun25 0:00 [khubd]
root 157 0.0 0.0 0 0 ? S Jun25 0:00 [ata/0]
So, perhaps I don't have a hardware problem, but a software problem?
Mark
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