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From Steve Loughran <ste...@apache.org>
Subject Re: 1Gb vs 10Gb eth (WAS: Re: Hadoop Java Versions)
Date Fri, 01 Jul 2011 15:47:07 GMT
On 01/07/2011 08:16, Ryan Rawson wrote:
> What's the justification for a management interface? Doesn't that increase
> complexity? Also you still twice the ports?

ILO reduces ops complexity. you can push things like BIOS updates out, 
boot machines into known states, instead of the slowly diverging world 
that RPM or debian updates get you into (the final state depends on the 
order, and different machines end up applying them in a different 
order), and for diagnosing problems when even the root disk doesn't want 
to come out and play.

In a big cluster you need to worry about things like not powering on a 
quadrant of the site simultaneously as boot-time can be a peak power 
surge; you may want to bring up slices of every rack gradually, upgrade 
the BIOS and OS, and gradually ramp things up. This is where HPC admin 
tools differ from classic "lock down an end user windows PC" tooling.


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