On Fri, 2006-03-17 at 11:15 -0600, Eric Chevalier wrote:

> I may be mistaken (it happens a couple times a year :-) ), but I was under
> the impression that a parallel sysplex did *not* require an ETR, only a
> sysplex timer.
> 
> ETR != Sysplex Timer

Increment the count.
ETR *IS* the Sysplex timer.
Which (of course) may not be external at all, and may not be *too*
external, and is a lousy time keeper.
But it *is* used as a common reference - one out of three will have to
suffice.

To run a Parallel Sysplex you *must* have an ETR (amongst other things)
which may be emulated.
And (of course) if you wish to use an external time source to synch your
ETR you have to plug another bit of hardware in to do the job.

IBM obviously finally got sick of customers actually trying to tie their
dinos into real networks and appear to have relented with STP.

Shane ...

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