It could be argued that power supply ride-through time has been reduced in the interest of energy efficiency. However, if we increase ride-through time even beyond what the ITIC/CBEMA curves suggest, we create opportunities for energy efficiency more broadly in the data center infrastructure.
For example, increased ride-through time could allow for the removal of some power distribution chain components, or to switch to lower cost substitute components. It also expands opportunities to introduce on-site renewable energy sources (such as wind and solar). Furthermore, it allows for non-traditional electrical distribution designs, with for example rack energy storage. This again eliminates larger, less efficient components, as is done in the Open Compute Project.
In any case, now that we see that a 10 milisecond ride-through time is the best that can be hoped for, there is reason to examine tolerance settings on electrical distribution devices farther upstream from the servers, to ensure coordinated switching or tripping.
By Bob Landstrom
(This is Part-7 of a 9-part series on a modern assessment of the ITIC/CBEMA curves)