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Conference azur::mcc

Title:DECmcc user notes file. Does not replace IPMT.
Notice:Use IPMT for problems. Newsletter location in note 6187
Moderator:TAEC::BEROUD
Created:Mon Aug 21 1989
Last Modified:Wed Jun 04 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:6497
Total number of notes:27359

156.0. "Clusters break MCC?" by KYOA::KOCH (My brother did not lose the election) Wed Jun 20 1990 14:07

	I recently had a hardware problem with a LAVC boot node. The
	field service tech asked whether I was running MCC. I said
	yes and they they replied "I was told a training that MCC causes
	clusters to break!". Where would a rumor like this start?

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156.1no problem on our clusterGOSTE::CALLANDERWed Jun 20 1990 15:035
    
    I don't know where they get started but we run MCC on our clusters
    without incident. I would be interested in knowning which "training"
    told them that...
    
156.2Was system crash really caused by MCC?KEEL::SAVAGEPeter SavageWed Jun 20 1990 21:097
    This is news to me.  MCC is in field test and if a problem exists we
    would like to know so that it can be corrected prior to releasing the
    product. I know of NO existing problem within MCC that would cause a
    system to crash.  Any additional information that you could provide
    would be helpful. 
    
    Peter 
156.3TOOK::SWISTJim Swist LKG2-2/T2 DTN 226-7102Thu Jun 21 1990 12:383
    This is SOP for field service.  They have a list of supposedly flaky
    software products that they blame when they can't find an intermittent
    hardware problem.
156.4cluster aliases as NODE4 instanceNAC::SCHLENERWed Jun 27 1990 13:2915
    Perhaps what they had heard was that MCC has the same problem as NCP
    in that DECnet Phase IV doesn't distinguish between an actual node name
    and a cluster alias. So that doing a modify/action command to a cluster
    alias would cause unpredictable results. 
    
    A while ago we (the DECnet Phase IV AM team - I was a member of that
    team) looked at solutions to the cluster alias problem and determined
    that we could not be 100 % certain if we were dealing with an alias.
    Plus, it would have impacted performance on every command severly.
    
    Hence, people need to be aware that MCC will have the same problem as
    NCP concerning using cluster aliases as a NODE4 global entity instance.
    
    		Cindy