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v. intr. [MIT AI Lab, after 2000: orig. probably from a Ren & Stimpy episode.] Any seemingly pointless activity which is actually necessary to solve a problem which solves a problem which, several levels of recursion later, solves the real problem you're working on.
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20071008 Monday October 08, 2007
CEC: Performability: Analysis of Performance and Availability in Complex Computing Systems

Richard Elling

Performability = Ability to Perform

Simple: when up performance = 100, down = 0

This is not an accurate(realistic,real life) representation of system performance and availability for complex systems..

This is something that Sun Managed Operations has been dealing with for years. Say you have 100 identical web servers, if 10 are down what state are you in.

This is even harder in complex environments. All of managed ops PSEs should attend this presentation, it isn't something that we all deal with, but as trusted solution providers/advisers this is right up our alley. Everything is done in tradeoffs.


Oct 08 2007, 08:49:04 PM EST Permalink

CEC: Myths, Missteps and Folklore in Networking

Radia hates computers :) The goals of this session and some other stuff:


The whole gallery, being updated as frequently as possible.

Some things are so obvious that we shouldn't need to talk about them, however everyone gets it wrong. IPv4 spec says use a version number of 4 but ignore the field. What if you send IPv6? No idea, bogus.

I am really enjoying this presentation. "There is no reliable 'I am dead' message protocol"

OSI layers above 5 are boring :)

So what about loops? spanning tree, came with a poem, this is why Radia thinks it made her so popular (Algorhyme) which was also the abstract of her paper.

Bridges fail dangerous, start forwarding if you don't see other bridge messages. Boston Hospital network meltdown when bridges couldn't keep up with wire speed.

TRILL - TRansparent Interconnection of Lots of Links (in IEFT)

Brain infestation: Data making it be there when you want it but making it gone when you want it gone (assured delete)

Woot! Slide decks are not the way to disseminate information, small papers and such.

Interesting observation: If everything was encrypted end to end you can't detect spam before it gets to you.

Now a short rant on VLANs

This was great!


Oct 08 2007, 07:28:53 PM EST Permalink Comments [2]

CEC: Putting the Science into Services

John used to be the CIO of SevenSpace, it was interesting to hear his take on the direction things are going in the management of complex systems and agile development of services.

Big Sun Managed Operations turnout, we had most of the front stage right corner and some more dissidents sprinkled in the crowd.

I think there are some really useful things coming out of the field. Didn't take any notes though, I was charging my laptop.


Oct 08 2007, 04:08:10 PM EST Permalink

Dtrace and Java: Spanning the Observability Gap

Not being a Java programmer this session may not be as useful as I will have hoped. However many, many, many of my customers are doing more, more and more java apps.

It will end up that I was correct, this is interesting and good to know, but it isn't going to be quite as useful for day-to-day and I had hoped it might be.

OK, DAVE is cool (missed acronym) something like Dtrace Advanced Visualization Environment. The call tree view...neet. I can see where this would have immediately pointed to something that we worked our way to and then had to argue about. (I'm not sure that if we had it we could have run it, but still cool and the developers could have done it)

JSDT (self defined probes...also cool)


Oct 08 2007, 02:12:49 PM EST Permalink

CEC 2007: Opening Day

Paris Hotel and Casino, home of Sun CEC 2007

Paris

In Vegas



The whole gallery, being updated as frequently as possible.


Oct 08 2007, 11:27:01 AM EST Permalink Comments [1]

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