May 9, 2008
CC:	 Andrew Fanara
United States Environmental Protection Agency
Re:	 Hewlett-Packard Response to the ENERGY STAR® Revised Definitions for
Computer Servers based on Draft 1 Specification Comments
From:	 Hewlett-Packard Company (HP), Enterprise Storage and Servers Business Unit
This document may be published on the Energy Star website.
Changes from Draft 1 appear to be an attempt to include lower-end computers into the
server specification. While this is understandable, it strengthens HP’s assertion that Tier
I of this specification must include a fully-described taxonomy of servers, reflecting the
many types of servers available today and in the near future. Without this taxonomy, we
are very concerned that Energy Star will attempt to unfairly equate server types that are
superficially and/or mechanically similar, but electrically and functionally quite different.
Section 1: Definitions
The descriptions in this section of the ENERGY STAR® Revised Definitions for Computer
Servers based on Draft 1 Specification Comments (Energy Star Revised Definitions)
document are all quite brief and are not generally thorough enough to describe the items
that they attempt to define.
Notes on this section indicate that there are no finalized definitions of the types of servers
that should be separated into different categories. HP has provided guidance in the past
on this subject, and we again provide that guidance below. Appendix A also illustrates
how HP server product families map onto the proposed Computer Server taxonomy.
�	 Definitions in this specification should cover business servers that are of more
complexity than the “desktop-derived servers” defined in the Energy Star for
Computers specification. Many types of servers will need to be described in enough
detail to determine whether they will be included or excluded from participation in
the Tier I requirements.
�	 The focus of the draft 1 specification appears to be narrowly defined and