[BBLISA] RE: bblisa Digest, Vol 49, Issue 4
Antonio Costa
antonio.costa1 at verizon.net
Tue Dec 18 11:43:22 EST 2007
Using a Dell Switch in a cluster?
What type of cluster is this?
Tony Costa
tonycosta at globaltelebrokers.com
-----Original Message-----
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Sent: Wednesday, December 12, 2007 12:00 PM
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Subject: bblisa Digest, Vol 49, Issue 4
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Today's Topics:
1. GigE and 100 Base T Ethernet? (Scott Ehrlich)
2. Re: GigE and 100 Base T Ethernet? (Nicholas Kathmann)
3. RE: GigE and 100 Base T Ethernet? (Rudie, Tony)
4. RE: GigE and 100 Base T Ethernet? (David Allan)
5. BBLISA LinkedIn group (Tom Metro)
6. Who broke audacity? (Scott Ehrlich)
7. sound problem fixed! (Scott Ehrlich)
----------------------------------------------------------------------
Message: 1
Date: Tue, 11 Dec 2007 13:50:06 -0500 (EST)
From: Scott Ehrlich <scott at MIT.EDU>
Subject: [BBLISA] GigE and 100 Base T Ethernet?
To: bblisa at bblisa.org
Message-ID: <Pine.GSO.4.64L.0712111349480.23691 at mint-square.mit.edu>
Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed
I am working on a quote for a cluster, including a GigE switch.
I have Belden IBDN AX350064 Gigaflex patch cables in hand. Would this cable
be
suitable, or is there better Ethernet cable I should use for a GigE cluster?
I've priced a Dell PowerConnect 2724 switch.
Thanks for insight.
Scott
------------------------------
Message: 2
Date: Tue, 11 Dec 2007 14:13:26 -0500
From: Nicholas Kathmann <nicholas.kathmann at kathmannconsulting.com>
Subject: Re: [BBLISA] GigE and 100 Base T Ethernet?
To: Scott Ehrlich <scott at MIT.EDU>
Cc: bblisa at bblisa.org
Message-ID: <475EE156.9090102 at kathmannconsulting.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Any CAT5E patch cable should be fine (I'm not sure you can even find
CAT5 cables anymore). I've worked with companies with 5000+ copper GB
patch cables, and haven't seen any buy a special or extra expensive
cable (well other than X-over cables). For my own network, I have zero
errors on any GB copper port with the last clear counters having been
380 days ago using CAT5E patch cables. You can get really cheap CAT5E
patch cables from Graybar, who has a warehouse near the Boston Herald on
Harrison Ave (South End / Chinatown area). With a corporate account
they can get as cheap as $1.95 a cable.
As far as I know, 10GB links are all fiber.
Thanks,
Nick
Scott Ehrlich wrote:
> I am working on a quote for a cluster, including a GigE switch.
>
> I have Belden IBDN AX350064 Gigaflex patch cables in hand. Would this
> cable be suitable, or is there better Ethernet cable I should use for
> a GigE cluster? I've priced a Dell PowerConnect 2724 switch.
>
> Thanks for insight.
>
> Scott
>
> _______________________________________________
> bblisa mailing list
> bblisa at bblisa.org
> http://www.bblisa.org/mailman/listinfo/bblisa
>
>
------------------------------
Message: 3
Date: Tue, 11 Dec 2007 14:36:40 -0500
From: "Rudie, Tony" <Tony.Rudie at fmr.com>
Subject: RE: [BBLISA] GigE and 100 Base T Ethernet?
To: "Nicholas Kathmann" <nicholas.kathmann at kathmannconsulting.com>,
"Scott Ehrlich" <scott at MIT.EDU>
Cc: bblisa at bblisa.org
Message-ID:
<825D4225D181F94192D39ED60C4999DE04A95A6F at MSGMROCLF2WIN.DMN1.FMR.COM>
Content-Type: text/plain; charset="iso-8859-1"
> Nick Says:
> (well other than X-over cables).
Make sure the XO cables are a different color! (horror story omitted...)
> far as I know, 10GB links are all fiber.
I think CX4 cables are copper, but not UTP. HP calls them "twinax".
Anyway, quite specialized. CX4 connector (NOT rj45) and 15M max len.
- Tony Rudii
------------------------------
Message: 4
Date: Tue, 11 Dec 2007 15:18:24 -0500 (EST)
From: David Allan <dave at dpallan.com>
Subject: RE: [BBLISA] GigE and 100 Base T Ethernet?
To: "Rudie, Tony" <Tony.Rudie at fmr.com>
Cc: Scott Ehrlich <scott at MIT.EDU>, bblisa at bblisa.org, Nicholas
Kathmann <nicholas.kathmann at kathmannconsulting.com>
Message-ID: <20071211145630.N64500 at kaazh.pair.com>
Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed
> I think CX4 cables are copper, but not UTP. HP calls them "twinax".
> Anyway, quite specialized. CX4 connector (NOT rj45) and 15M max len.
That's right. CX4s are copper, and they look totally different from RJ45.
They are roughly the size and shape of a VGA cable, but there's a flat
tongue with contacts on it that runs down the middle of the connector
where the middle row of pins would be on VGA. Here's a picture:
http://www.cablesondemand.com/images/products/NW-CX426MM000.jpg
Dave
------------------------------
Message: 5
Date: Tue, 11 Dec 2007 19:01:27 -0500
From: Tom Metro <tmetro+bblisa at vl.com>
Subject: [BBLISA] BBLISA LinkedIn group
To: L-bblisa <bblisa at bblisa.org>
Message-ID: <475F24D7.1030203 at vl.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
BBLISA now has a LinkedIn group. (If you're not familiar, LinkedIn is
a social networking site for professionals.)
Your direct LinkedIn network is supposed to consist of people that
you've worked with before and can vouch for. In contrast, user group
connections are like 2nd level contacts (people you know through other
people). So networking via a user group broadens your network without
violating that principle.
To join, go to:
http://www.linkedin.com/e/gis/45411/0F3ACD5E5B0A
No one is pre-approved (which would have required uploading everyone's
email address to LinkedIn), so you'll be told you have to wait for the
group manager to approve your request. You don't have to do anything
further - your request will be approved within a few days.
-Tom
--
Tom Metro
Venture Logic, Newton, MA, USA
"Enterprise solutions through open source."
Professional Profile: http://tmetro.venturelogic.com/
------------------------------
Message: 6
Date: Tue, 11 Dec 2007 20:02:21 -0500 (EST)
From: Scott Ehrlich <scott at MIT.EDU>
Subject: [BBLISA] Who broke audacity?
To: bblisa at bblisa.org
Message-ID:
<Pine.GSO.4.64L.0712112002130.3371 at home-on-the-dome.mit.edu>
Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed
I use my Ubuntu Gutsy box for three main things - email via ssh, email via
web,
and preserving my cassette music collection via Audacity. Everything has
been
working flawlessly, until tonight. I'd last successfully recorded stuff
two
nights ago (Sunday), most of the day.
But today, when I turned on my system, audacity didn't show the normal
device
it wants to record from (line 1). When I told it to record, it claimed the
device was in use. After a couple rounds of broken record attempts did I
realize the device options were not listed.
I visited Edit > Preferences and discovered the playback and record
drop-down
lists were non-functional.
I visited System > Preferences > Sound and tested audio. It worked fine.
What happened to audacity? Did some apt-get or aptitude update package
break
something from Sunday night, the last time I think I may have updated stuff?
I tried an aptitude reinstall audacity, and did an rm -rf ~/.audacity-data,
but
nothing helps.
What happened?
Thanks.
Scott
------------------------------
Message: 7
Date: Wed, 12 Dec 2007 05:23:09 -0500 (EST)
From: Scott Ehrlich <scott at MIT.EDU>
Subject: [BBLISA] sound problem fixed!
To: bblisa at bblisa.org
Message-ID: <Pine.GSO.4.64L.0712120521300.3253 at no-knife.mit.edu>
Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed
I was reminded of lsof (as root to show more), a tool I've never really
used, but knew of.
That found pulseaudio. Once removed, and with a reboot, sound is back.
Scott
------------------------------
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