How to add an IP alias with UCX much the way you would

[David Taubner]

Tim is correct about the alias component of UCX.  The newer 'TCPIP Services
for VMS' version 5.3 that I'm running on our site does have a better
alternative - there is software included, namely TCPIP LOAD BROKER - that
seems to do quite a decent job of emulating load balancing using the same
parameters as LAT (so says the manual).  I have it updating the alias every
90 seconds.


David Taubner
CIS Systems Administrator
Health Sciences Centre
Winnipeg, Manitoba
Canada

-----Original Message-----
From: Tim Oakley [mailto:toakley at mailhost.maury-imprimeur.fr]
Sent: Tuesday, September 10, 2002 11:23 AM
To: samba-vms at lists.samba.org
Subject: How to add an IP alias with UCX much the way you would


The UCX command 'set interface/clus' allows multiple VMS cluster nodes
to share a 'cluster' ip adress, however it does not work the same as a
DECnet alias where a semblance of load balancing is involved. Instead a
cluster alias results in one of the named servers dealing with all IP
traffic directed to the alias adress. The machine which 'holds' the
adress is called the 'impersonator' in UCX speak. If the current
'impersonator' is shutdown or crashes then one of the other configured
nodes takes over as impersonator automatically without intervention from
support folks. 

Very fault tolerant but unfortunately no concept of load sharing.
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Tim OAKLEY 
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