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Enterprise Computing: HP Blades Day – Lab Session – Part II

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This post is the second of a series of video posts from the HP Blades Day in February 2010.  Previous posts:

HP Blades Day – Lab Session – Part I

In this video, James Singer talks about power supplies.  This may not seem like the most interesting subject in the world, however as you will see, HP have thought in detail about the important features of PSU design.  The interesting ones for me are:

  • Efficiency – the latest power supplies run at 90% or more efficiency at just 8% load, so there’s very little wastage in terms of power when the chassis is experiencing variable load.  In addition, using a feature called DPS (Dynamic Power Saver), PSUs are powered up and down on-demand in order to keep efficiency in that optimal 25-40% range.
  • Reliability – You’ll hear me question James a number of times, once on the subject of load stress.  There’s no reduction in reliability from using DPS or from running PSUs up to their rated specification.

One of the features of blades this lab session showed me was the need for ultra-high reliability.  After all, a blade environment can contain hundreds of virtual machines and the impact of losing a chassis is enormous.

Of course I have to apologise in advance for the shaky camera work and a significant amount of Techhead’s head in shot!

Enjoy.

About Chris M Evans

Chris M Evans has worked in the technology industry since 1987, starting as a systems programmer on the IBM mainframe platform, while retaining an interest in storage. After working abroad, he co-founded an Internet-based music distribution company during the .com era, returning to consultancy in the new millennium. In 2009 Chris co-founded Langton Blue Ltd (www.langtonblue.com), a boutique consultancy firm focused on delivering business benefit through efficient technology deployments. Chris writes a popular blog at http://blog.architecting.it, attends many conferences and invitation-only events and can be found providing regular industry contributions through Twitter (@chrismevans) and other social media outlets.
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