On Thursday 14 February 2008 11:05, Aaron Kulkis wrote:
Randall R Schulz wrote:
On Thursday 14 February 2008 06:18, Greg Freemyer wrote:
...
Per,
I don't know how you measured the load, but it is important to measure very short power surges. In particular, I'm suspicious of that load during raid1 resync. Could your technique catch a 10 msec spike etc?
Surely the capacitors in the power supply and elsewhere would absorb such brief demand spikes, no?
Not so much absorbing spikes as much as to provide extra current needed for the spike demanded by system components -- without the current spike the sudden increase in demand results in voltage spike which sags (i.e. goes to ground instead of higher potential).
I meant "absorb the spike in demand by supplying the transient requirement."
...
Motor activation is a big one. They all demand power surges to get moving.
But they stay spinning as long as the device is on (excepting a software-driven shutdown of the driver motor, of course). If we're talking about demand spikes on 10-millisecond timescale, they cannot be coming from the spindle motors. Randall Schulz -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org