30 Oct
2007
30 Oct
'07
9:09 a.m.
Chuck Guzis wrote:
On 30 Oct 2007 at 10:19, Sridhar Ayengar wrote:
For a very graphic example of that philosophy, consider this:
In mid-2004 I ran into a guy who works at HP/Austin. His team had
just finished a major project. They had just completed certification of
the first 10/100 ethernet driver for Non-Stop OS.
Doc Shipley
Refresh my memory how those worked? Two
processors in lock-step? Three
processors in a voting quorum?
Nothing that simple. Special software and hardware. As was driven
home to me by a Tandem engineer who was also a good friend, the term
of art used by Tandem is "Nonstop" not "Fault tolerant". A world of
difference between them. For a very good analysis, check out the
paper "Why Do Computers Stop and What Can Be Done About It?" by
Tandem's Jim Gray. It should be somewhere on the web, given its
importance. It describes in very eloquent terms, the Tandem
philosophy.