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The Revenge of the Anti-Penguin
Redline the engines, there's nothing left to lose.
Cell blades in BladeCenter E cause power confusion 
20th-Jun-2009 12:35 pm
I'm pretty sure this is a bug in the advanced management module, I know the QS20 blades aren't well supported at this point.

In any case, I put in three of the QS20 blades with drives and powered them on, hoping one of them would just boot up and get a DHCP address... no such luck.

I took a glance at the power usage graph and immediately powered off the blades...

Like I said, I'm pretty sure this is a bug... I'm running this off a single 110 volt circuit, wouldn't it trip the fuse if this were real?

Comments 
20th-Jun-2009 05:12 pm (UTC)
Depends on what the fuse is rated for :). I know that residential meters typically top out at 160 Amps which is actually a lot when you stop to think about it, so while the breaker/fuse in your house is probably lower than that, its not too much lower(now, GFI's(Ground Fault Interrupt) like you have in a typical bathroom, trip a lot faster, not that I would recommend holding the hairdryer when you drop it in the tub to TEST that theory...). For reference 110V*160Amp = 17.6KW, which is credibly greater than the 5.5KW in your graph, so yeah, that could be correct. On the plus side, sounds like you've got a great space heater for those Boston winters ;).

Also, I'm a better programmer than electrical engineer, so I could be entirely wrong...
20th-Jun-2009 05:46 pm (UTC) - Hopefully not...
I wonder if I can access my power bill online...
I'm getting curious.

In any case, I think I have 15amp fuses for each circuit... *checks*

Ok, 15 and 20 amp fuses. Assume I'm plugged into a 20 amp fuse, that's a max of 2200 Watts, so I'm thinking it must be a bug. Still, I don't want to use all that power at once, my wallet is sensitive that way.
20th-Jun-2009 07:09 pm (UTC) - Re: Hopefully not...
Are those 220V circuits the fuses are on?

Frankly, I hate AC stuff :). RMS can kiss my a$$(and I'm not talking about Stallman, fyi). Uh, don't tell anyone, but I got a D in Power :). Of course, bugs in their code, bugs in my math, it all works out in the end...

Unfortunately, anything in the neighborhood of 5KW is enough to notice on the power bill. Probably the easiest way to check the usage for real is to get a Kill-A-Watt, since they're not THAT expensive, and they're useful for other experiments that I suspect you would enjoy.

As to accessing your bill online, the easiest way to even GUESS if that's possible is to take a look at your meter and see if it has any digital readouts, or if its bit bigger than normal, or has something like a sharkfin sticking out the back. If its not a digital meter, or an upgraded meter, then its just passively recording usage mechanically to be read once a month. Even it is somewhat smart, its still just as likely to be a "drive by" radio read(although, there's potential for hacking to get your *own* readouts). Ironically, some mechanical meters do have digital "upgrades", basically they drill a hole in it and put in a couple of pieces optical hardware to do something similar to Gray encoding to "read" the disk as it turns. Even if they have all this, the industry just hasn't been interested in providing this realtime data to their customers.

So... um, yeah, just get a Kill-A-Watt :). There might be some nifty X10 gadgets though, if you're interested in the home monitoring stuff. For reference, I do not own a Kill-A-Watt, but I've heard good reviews about them(if I weren't cynical about power stuff, I would probably have bought one by now, also, lack of money for toys tools in general).
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