Re: [ldm-users] LDM: Hey, hey, you, you, get onto my cloud

On Fri, 17 Jun 2011, Wojtowicz, David P Jr wrote:

Virtualization guys rarely understand full-load machines (like a busy LDM
server).  My guess is the virtual machine won't be able to keep up with
demand at first on the initial settings.  But rather than be embarrassed
after talking you into it, they'll have to provision a much larger
dedicated chunk of their resources than they anticipated it costing them.
You come out the winner there with expensive hardware being essentially
dedicated to serving you but provided by someone else.

We're virtualizing more and more stuff here, and it can provide some
dramatic efficiencies, but only for certain kinds of loads.  Virtualizing
a 100% busy machine costs more than operating a dedicated server.

I'd certainly run the queue in RAM instead of a disk file.  We've been
using RAM-only queues for years on various LDM servers and have gotten
away with using less powerful IO than would be needed otherwise.

Thanks, David. Your thoughts piggyback on others. People who haven't worked with this data before don't realize how punishing it is to
hard drives. They've been pushing it hard here at NIU recently,
but they might get more than they bargained for if they say
they want to do it...and then I type "ldmadmin start" for the first time with L2/L3 and the rest of the NOAAport data feed slamming in!

Gilbert Sebenste                                                     ********
(My opinions only!)                                                  ******
Staff Meteorologist, Northern Illinois University                      ****
E-mail: sebenste@xxxxxxxxxxxxxxxxxxxxx                                  ***
web:                                      **

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