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Perhaps someone should do a network analysis of Google's data centers
and servers and determine the weakest links.  Remove the edges and see
which data centers are vulnerable, then put in redundancy.

Alvin


On Wed, Feb 25, 2009 at 10:08 PM, Bernie Hogan <[log in to unmask]> wrote:
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>
> Gmail was down yesterday for two and a half hours. This led to no end
> of worry for those of us in Europe where this was in the middle of the
> morning although, many North/South Americans might not have even been
> awake, or even noticed.
>
> Google gave an explanation today:
> "Unexpected side effects of some new code that tries to keep data
> geographically close to its owner caused another data center in Europe
> to become overloaded, and that caused cascading problems from one data
> center to another. It took us about an hour to get it all back under
> control."
> http://gmailblog.blogspot.com/2009/02/update-on-todays-gmail-outage.html
>
> It reminds me of the power outages in the U.S. in 2005 and other
> cascading network effects (and particularly the great examples in
> Duncan Watts' six degrees). But I found it a bit surprising that this
> would actually happen to Google - I thought everyone was considering
> their systems as networks these days!
>
> So I thought I'd share (and commiserate with other gmail users who
> discovered the lack of fault tolerance in their own media network).
>
> Take care,
> BERNiE
>
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