sharing a power supply
award at andorra.ad
Wed Jul 2 13:41:02 EDT 2003
I am building a small beowulf with the following configuration:
- 4 motherboards w/ onboard Ethernet
- 1 hard disk
- 1 (small) switch
- 1 ATX power supply shared by all boards
The intended boot sequence is the classical (1) master boots off
hard disk; (2) after a suitable delay, slaves boot off master
with dhcp and root nfs.
I would appreciate comments on the following:
a) A 450 W power supply should have ample power for all -
but can it deliver on the crucial +5V and +3.3V lines? Has anybody
got real-world intensity measurements on these lines for Athlons
I can compare to the supply's specs?
b) I hung two motherboards off a single ATX supply. When I hit
the switch on either board, the supply goes on and both motherboards
come to life. Does anybody know a way of keeping the slaves still
until the master has gone through boot? e.g. Use the reset switch?
Can one of the power lines control the PLL on the motherboard?
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