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