[Beowulf] Green Cluster?
smulcahy at aplpi.com
Mon Jul 21 03:13:02 PDT 2008
Perry E. Metzger wrote:
> Here is how you can turn them on:
> There is even open source software described on that page.
Wake-on-Lan works very well - when it works. We were using it quite
successfully on a small cluster we built for remote power on (after
remote power off). We had to upgrade the BIOS recently for an AMD
erratum and the BIOS upgrade had the unfortunate side-effect of mangling
WOL while fixing the processor problem.
We can reset the WOL flags and re-enable it on individual nodes, but
unfortunately when the nodes are power-cycled, the WOL flag goes back to
its default (off) state. Given the typical use case of WOL, it seems
unfortunate that a power cycle resets it.
We've made a stab at raising the matter with the vendor but since the
cluster in question is only 20 nodes I don't think they take us
seriously (or at least not as seriously as you folks with hundreds of
nodes). So YMMV.
Stephen Mulcahy, Applepie Solutions Ltd., Innovation in Business Center,
GMIT, Dublin Rd, Galway, Ireland. +353.91.751262 http://www.aplpi.com
Registered in Ireland, no. 289353 (5 Woodlands Avenue, Renmore, Galway)
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