LittleFe:Wake-on-LAN

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WOL should be enabled each each node's BIOS configuration. If this is present then after a clean boot where the node runs the command:
ethtool -s eth0 wol g
the node should come up find after recieving the magic packet.

Magic packets are sent using the command:
etherwake <MAC Address>

Nodes will not start up without the operating system running once. Possible useful links: http://www.beowulf.org/archive/2001-September/004778.html
http://www.beowulf.org/archive/2002-October/008218.html
http://www.hardwareforumz.com/ftopic-2135-15-days0-orderasc-.html