17 Oct
2007
17 Oct
'07
1:18 a.m.
On Tue, 16 Oct 2007 21:49:44 +0100
Jules Richardson <julesrichardsonuk at yahoo.co.uk> wrote:
That's the sort of thing worthy of video. Big
power control stuff is
fun :)
You can visit it: http://www.cray-cyber.org/
Was that rating for the entire system, or just the CPU
& I/O (no
drives etc.)?
It was just the MG starting. The machine was switched off. Current
droped to a few A once the MG got to speed. The MG has a big flywheel.
Therefore it needs all that energy to get up to speed. The idea is that
the flywheel stores enough energy to compensate short power outages. If
power stays off longer the disel kicks in. (But at Cray-Cyber they
skiped the disel. ENOSPACE.) AFAIK a minimal configuration of the
machine (CPU + I/O) needs about 20 kW.
--
tsch??,
Jochen
Homepage: http://www.unixag-kl.fh-kl.de/~jkunz/