Cray J932SE (was Re: Straight 8 up on Ebay just now)
Swift Griggs
swiftgriggs at gmail.com
Tue Jul 19 13:04:52 CDT 2016
On Tue, 19 Jul 2016, ethan at 757.org wrote:
> The Cray is single phase, the only thing I've ever owned that was 3
> phase was the laser stuff. Now my solid state laser projector uses 100
> watts and producsed half the power of the argon that used to take 3ph @
> 30A (and still tripped the breaker sometimes.)
I haven't been able to articulate anything witty, but I'll go ahead and
just say: Ethan I don't know what you do with those BF-lasers, but it
sounds damn awesome, anyway. Your stock just went up. It's hard to make
lasers anything but sci-fi radical coolness.
> I've heard sometimes the utility will indeed give you 3phase but you
> have to pay them to replace the transformer and it's very very
> expensive.
Yep. It's happened in every case I've been involved with here in Colorado
(ie.. residential or small buildings, not in data centers).
> Normally it's people buying used milling equipment that are after it
> from my experience. There are rotary converters and solid state
> converters but probably not ideal for huge loads.
... and as I mentioned before, they can break. So, even if your VCF will
handle the load, your uptime requirement might be a dealbreaker if you
have commercial intentions.
> The Cray uses 5 x Pioneer magnetics power supplies that I believe are
> identical to those in the Sun E10000.
"back in the day" I was a certified (not as an FE, though) in various ways
for the E10k, E15k, and E25k. We had several at Oracle when I worked
there. However, I don't remember that detail (the brand of the PSs). I'm
sure you are right, though.
> Note - in the modern datacenter in the US it's not uncommon for
> everything to be run on 208, but everything would run on 120.
Yep, that's my experience, too. Although many telco datacenters still use
DC. They are funny like that.
-Swift
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