[Beowulf] Re: cluster fails to boot with managed switch,but 5-port switch works OK

Vallard Benincosa vallard at benincosa.com
Wed Dec 2 10:59:09 PST 2009

Spanning Trees are usually the biggest culprit in pxe booting and switch
problems.  For SMC switches I think you just need to do something like:

telnet smc
interface ethernet 1/1  # if this is the interface your client node is on
spanning-tree edge-port
copy run start

On Wed, Dec 2, 2009 at 10:36 AM, Hearns, John <john.hearns at mclaren.com>wrote:

> I've tried resetting the SMC switch to factory defaults (with
> auto-negotiate on).  I've checked the /etc/beowulf/modprobe.conf and it
> doesn't seem to be demanding anything exotic.  We've tried swapping out
> to another SMC switch but that didn't change anything.
> No idea really, as I don't use SMC switches.
> First thing I would do would be to get a laptop with Linux on, and
> attach it to the SMC switch.
> Configure the Ethernet interface to use DHCP, then ifconfig it down then
> ifcoinfig it up.
> Run tcpdump eth0 as you do this, and tail -f /var/log/messages
> If it gets a DHCP address (and of course on the cluster head node there
> is a pool of free DHCP addresses configured)
> the test tftp file transfer. Set the tftp daemon on the head node to run
> in debug mode, and start it up.
> Try a tftp get of a test file on the laptop.
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