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Re: inventory


--- Greg Lindahl <lindahl@conservativecomputer.com> wrote:
> On Wed, Feb 28, 2001 at 03:16:56PM -0800, Peter Badovinatz wrote:
> 
> > but we still have to agree as to the positions or layout.  We also
> > usually support (in fact usually demand to eliminate single points
> > of failure) each node have multiple network connections, and
> > multiple names, so a single hostname is not sufficient for us.
> 
> 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.  It takes the
node number, held in a local config file, and follows some agreement protocols
to "advertise" the IP addresses which it owns at the time it boots.  It is
common for the node to have a persistent hostname/IP address, but, HACMP (which
is managing all of the HA) never uses that name and doesn't control it, so if
the adapter to which it's connected dies, that address dies.

This does not mean this is the right or the wrong model, it is a model.

> -- greg
> 
> 
> Linux-cluster: generic cluster infrastructure for Linux
> Archive:       http://mail.nl.linux.org/linux-cluster/


=====
These have been the opinions of:
Peter R. Badovinatz -- (503)578-5530 (TL 775)
wombat@us.ibm.com/tabmowzo@yahoo.com
and in no way should be construed as official opinion of 
IBM, Corp.

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Linux-cluster: generic cluster infrastructure for Linux
Archive:       http://mail.nl.linux.org/linux-cluster/