[K12OSN] bootup slow -- nfs server not responding

Rob Owens rob.owens at biochemfluidics.com
Mon Sep 8 16:07:41 UTC 2008

Les Mikesell wrote:
> Rob Owens wrote:
>> I'm running K12LTSP 5.0EL 32-bit on a desktop-like machine with software
>> RAID 1 using SATA drives.  Processor is a dual-core AMD 5000+, NIC is
>> gigabit, and I just upgraded to 4GB RAM (from 2GB).  It's serving 11
>> GNOME sessions and 5 rdesktop sessions.  The server also runs MySQL and
>> Apache for some very lightly used web applications.
>> The reason I upgraded the RAM is because I've been getting slow boot
>> times on the thin clients, with the message "nfs server not responding"
>> showing up at least 10 times during the boot process.  The clients
>> eventually boot successfully.  The upgrade didn't seem to help, but hey,
>> it was cheap and easy to try.
>> iftop says I'm only using about 20Mb of bandwidth on the server's NIC.
>> top shows the CPU usage is usually below 5%, and rarely hits 40%.  So I
>> think my hardware is up to the task.  Are there any NFS tweaks I should
>> be employing to eliminate the "not responding" errors, thereby speeding
>> up my boot process?
>> By the way, I have very little other network activity so I don't think
>> my wires or my switch are saturated.
> Are you up to date with the current 5.2 updates?  I think one of the
> fairly recent kernel updates had NFS performance fixes - I'm not sure if
> it will help with this issue, though.
All up to date -- except for the kernel.  I have that excluded in
yum.conf in order to avoid reboots.  I'll update and reboot tonight and
see how that goes.  Thanks for the advice.


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