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datacenterknowledge.com – Making changes to Google’s search infrastructure is akin to “changing the tires on a car while you’re going at 60 down the freeway,” according Urs Holzle, who oversees the company’s massive data center operations. Google updates its software and systems on an ongoing basis, usually without incident. But not always. On Feb. 24 a bug in the software that manages the location of Google’s data triggered an outage in Gmail, the widely-used webmail component of Google Apps.

Just a few days earlier, Google’s services remained online during a power outage at a third-party data center near Atlanta where Google hosts some of its many servers. Google doesn’t discuss operations of specific data centers. But Holzle, the company’s Senior Vice President of Operations and a Google Fellow, provided an overview of how Google has engineered its system to manage hardware failures and software bugs. Here’s our Q-and-A:

Data Center Knowledge: Google has many data centers and distributed operations. How do Google’s systems detect problems in a specific data center or portion of its network?
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Urs Holzle: We have a number of best practices that we suggest to teams for detecting outages. One way is cross monitoring between different instances. Similarly, black-box monitoring can determine if the site is down, while white-box monitoring can help diagnose smaller problems (e.g. a 2-4% loss over several hours). Of course, it’s also important to learn from your mistakes, and after an outage we always run a full postmortem to determine if existing monitoring was able to catch it, and if not, figure out how to catch it next time.

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PCWorld – Carriers and net neutrality proponents found themselves at odds Monday during a discussion on whether to place strict net neutrality conditions on any broadband network built using economic stimulus money.

Held at the U.S. Department of Commerce in Washington, D.C., Monday, the panel discussion was intended to give the National Telecommunications and Information Administration (NTIA) and the U.S. Department of Agriculture (USDA) guidelines for funding companies that pledge to built out broadband networks in underserved areas. The crux of the debate was whether the government should enforce a strict policy of nondiscrimination on networks built with broadband stimulus money.

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PCWorld – In these tough times, the notion of free becomes more attractive than ever.

We’ve sifted through the Web to find and test 101 of the best free downloads and services out there. We concentrated on utilities and other helpers that can rev up your smartphone’s performance, streamline your social networking experience, and tame your PC while bending Windows to your will.

Our also list targets great productivity pumpers, security boosters, PC enhancers, and browser builders. But this list isn’t all deadly serious: We also pinpointed the best no-cost ways to find and manage video, and to do much more with your digital photos and music.
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PCWorld – Privacy watchdogs in the United Kingdom want to close down Google Street View, only days after the service was launched in the country. Google has already received hundreds of requests to take down photos of various areas in the U.K. and could even face legal actions.

Launched on March 19, Google Street View U.K. brings 360-degree views of roads and homes from 25 British towns and cities. Just like the popular U.S. version of the service, Street View U.K. includes photographs of millions of residential houses, cars, and people.

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InfoQ – Expression Web SuperPreview allows developers to render web pages in different browsers simultaneously to detect layout issues. SuperPreview will be available as a standalone version as well as integrated into Expression Web. The standalone version will be made available for free and a trial version is available for download today, named Expression Web SuperPreview for Windows Internet Explorer.

About the same time as this new product was made available, Microsoft published an article describing the product and the motivation for creating it:

Today’s browser wars make the late 90’s look like a minor skirmish. In addition to Firefox and IE, we’ve got multi-platform versions of Safari, Opera, Chrome, and a wealth of mobile phone browsers. In addition, there are multiple versions of all these browsers, many of which have different rendering idiosyncrasies (I’m talkin’ about you, IE6/7/8).

They continue by listing common problems web developers have today:

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Many browsers support both Mac and Windows. Devs want to test in (at least) Mac Safari, which doesn’t render the same as Safari on Windows.

The ergonomics of browser testing is awkward. Many devs load their site on a staging server and have a battery of machines running different browsers. They have to manually load a page in each machine and then walk to each individual machine to compare the different monitors.

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