[Beowulf] Timeout on eth0 when booting disk less

tegner at renget.se tegner at renget.se
Mon Mar 13 06:02:12 PDT 2017

STP seems not to be enabled. However, under Port/Trunk Settings "Flow Ctrl" was enabled, and I turned that off (which didn't seem to matter).

Switch is an very old HP Procurve, and it would probably be a good idea to update firmware on it.



On 12 March 2017 at 12:19:43 +01:00, John Hanks <griznog at gmail.com> wrote:

> Do you have "spanning-tree portfast" enabled on your switch ports? The syntax will depend on switch vendor, but the principal is the same. When the nic comes up there can be a significant delay while STP decides whether to pass packets or not, which can wreak havoc on things that expect the network to Just Work(tm). portfast tells the switch to assume a client, not another switch is on the port.
> jbh
> On Sun, Mar 12, 2017 at 1:02 PM Jon Tegner <<tegner at renget.se>> wrote:
> > Hi,
> > 
> > 
> > I'm booting some nodes disk less, using root file system on NFS. The
> > first phase (PXE, tftp etc) works without problems. The second phase,
> > when the system is actually supposed to boot over NFS the machine hangs
> > about every second time - and it seems to be a result of the relevant
> > nic (eth0) not negotiating its properties before some kind of timeout
> > kicks in. Obviously resulting in a failure to boot the NFS file system.
> > If I reboot the node it eventually works.
> > 
> > 
> > This could possibly be a problem with the switch, but one remedy would
> > seem to be to extend the time before the timeout kicks in (it seems to
> > be a few seconds at the moment). Any hints on how to achieve this?
> > 
> > 
> > Thanks,
> > 
> > 
> > /jon
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