Re: inventory

["Jeff Darcy" <linuxguy@tambreet.com>]

> > I thought that in most HA clusters, each machine has a "true name" (&
> > IP) that's unique and never changes, and then other names (& IP
> > addresses) that are associated with services that move around when
> > things fail? A single, unique hostname is still sufficient, and you
> > can make them one byte. Then you don't have any need for an extension?
> >
> That is most common, yes.  However, there is one example (with which I'm
> familiar) that this is NOT the case:  HACMP on AIX.  All IP addresses are
> migratable, there is no persistent node name for any machine.

This was not true when I was working on HACMP.  Each interface had a "boot
address" that only it could use, in addition to one or more service
addresses.  When a node came up, it would use its boot address(es) to join
the cluster, and then switch to its properly-assigned service address(es).
Similarly, each node had a node name separate from all of its interface
names, precisely to avoid the sorts of confusion we're talking about.

Did these things change sometime after '95, did Phoenix undo a lot of our
careful design, or is one of us misremembering?



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