[Info-vax] set cluster/expected_votes

[Malcolm Dunnett]

Malcolm Dunnett wrote:

> 
> Sure you can, use the REMOVE_NODE option of SYS$SYSTEM:SHUTDOWN.COM when 
> you shut down the no longer wanted 2 vote member.
> 
> (google for OPC$REMOVE_NODE if you want more information, that is the 
> mechanism that SHUTDOWN.COM uses)

OK, a little more research suggests we are both right :-)

In earlier versions of VMS, SHUTDOWN.COM used the SET 
CLUSTER/EXPECTED_VOTES mechanism to remove a node. This mechanism does 
not work for removing the "second to last voting member" from the 
cluster ( as suggested earlier in this thread). It's a race condition 
type of thing - the node going down is still contributing votes at the 
time the command is executed so its votes apply towards the quorum and 
prevent it from being lowered.

Current versions of VMS use OPC$REMOVE_NODE which removes this 
limitation. I'm not sure when this changed (VMS 8.0?). I believe this 
essentially renders the SET CLUSTER/EXPECTED_VOTES mechanism redundant.

If Hoff still follows this group perhaps he could jump in and tell us 
the whole story?

See: http://tinyurl.com/vmsmgmtguide for more gory details on the old 
method.