[Beowulf]Infrastruture planning for small HPC 40/100 gigabyet eyhernet or Infiniband?

MDG himikehawaii1 at yahoo.com
Mon Jul 28 00:45:14 PDT 2008

seems some people are not reading.
1)fire code here requires all lectrical wores to be in metal cinduit, so "oulling" wire is not possib;e.
2) I never have or ever implied I HAD A SAFETY or fire issue, I just am trying to anticipate needs in the future (near) as several overseas business also will be using my home as offsite storage servers.
Can we try and het on topic?  Thank you for the person who like me planned ahead but had the luxury of doing during construction.
there will be a huge market as the USA lags far behind and we are beong leap-frogged by many emerging markets, just look at cell phones.

--- On Sun, 7/27/08, Nifty niftyompi Mitch <niftyompi at niftyegg.com> wrote:

From: Nifty niftyompi Mitch <niftyompi at niftyegg.com>
Subject: Re: [Beowulf]Infrastruture planning for small HPC 40/100 gigabyet eyhernet or Infiniband?
To: "Eugen Leitl" <eugen at leitl.org>
Cc: "Nifty niftyompi Mitch" <niftyompi at niftyegg.com>, Beowulf at beowulf.org
Date: Sunday, July 27, 2008, 1:51 PM

On Sun, Jul 27, 2008 at 09:28:07PM +0200, Eugen Leitl wrote:
> On Sat, Jul 26, 2008 at 09:15:23PM -0700, Nifty niftyompi Mitch wrote:
> > Did I read this correctly? 
> > Are you cutting holes in the walls of a home.....?
> Real homes have cable ducts -- I'm limited to drilling through walls.
> Unfortunately, due to lousy electric installation I'm stuck with 
> severe ground loop issues (I catched that too late orelse
> I would have put in a heavy ground wire strung along the CAT 6/7). 
> Galvanic separation would be a god-send -- but for the price 
> tag, and unavailability of GBit polymer optical.
> CAT 6 is great, except if you see sparks when plugging in RJ-45s.
> Also, most systems tend to shutdown spontaneously overnight when
> on such dirty network.
> > Also all wires in the wall MUST be safety rated for such use.

OK if you have severe ground loop issues you must rethink
what you are doing!   Ground loops generated by a bad power
install can have almost unlimited currents and present
a serious fire hazard.  Get the problem fixed.

Contact a qualified electrician and find out what the root cause is.
AFAIK most network switches do provide MAC level isolation at the physical 
layer so I am confused and _concerned_ about your comment about seeing sparks
at the RJ-46.   Get the problem addressed promptly.

	T o m  M i t c h e l l 
	Looking for a place to hang my hat.

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