ASG
IBM
Zystems
Cressida
Icon
Netflexity
 
  MQSeries.net
Search  Search       Tech Exchange      Education      Certifications      Library      Info Center      SupportPacs      LinkedIn  Search  Search                                                                   FAQ  FAQ   Usergroups  Usergroups
 
Register  ::  Log in Log in to check your private messages
 
RSS Feed - WebSphere MQ Support RSS Feed - Message Broker Support

MQSeries.net Forum Index » Clustering » What is failover, maybe that's not what i want.

Post new topic  Reply to topic
 What is failover, maybe that's not what i want. « View previous topic :: View next topic » 
Author Message
GregJ
PostPosted: Mon Mar 22, 2004 7:28 am    Post subject: What is failover, maybe that's not what i want. Reply with quote

Acolyte

Joined: 24 Oct 2001
Posts: 69
Location: Markham, On. Canada

Maybe i'm not clear what the true definition of failover is... but in reading the "MQSeries Primer" Page 11 states this:

In another scenario involving queue B, we notice that the third queue manager is down and the third instance of queue B is not available. The sending queue manager becomes aware of this problem because it subscribed to information about all queue manager and queues it is interested in, that is, where it sends messages. As soon as it finds out that there is a problem with the third instance of B, it distributes messages to the first two instances only. Special messages about changes of the status of cluster objects are instantly published to all queue managers that
subscribed to that object.


That's what i need, if one queue manager is not responding, I want everything diverted to another. It may not be 'failover' per se, but will clustering achieve this? or would "distribution lists'" be an easier route.

Thanks[/quote]
Back to top
View user's profile Send private message
Michael Dag
PostPosted: Mon Mar 22, 2004 7:44 am    Post subject: Reply with quote

Jedi Knight

Joined: 13 Jun 2002
Posts: 2602
Location: The Netherlands (Amsterdam)

if you are fine with so called 'stuck' messages (messages not being
processed on a certain queuemanager but already on that queuemanager
having a 'problem') during failover then clustering will do fine.
_________________
Michael



MQSystems Facebook page
Back to top
View user's profile Send private message Visit poster's website MSN Messenger
EddieA
PostPosted: Mon Mar 22, 2004 9:15 am    Post subject: Reply with quote

Jedi

Joined: 28 Jun 2001
Posts: 2453
Location: Los Angeles

Quote:
or would "distribution lists'" be an easier route

This option would send the SAME message to multiple Queue Managers.

Cheers,
_________________
Eddie Atherton
IBM Certified Solution Developer - WebSphere Message Broker V6.1
IBM Certified Solution Developer - WebSphere Message Broker V7.0
Back to top
View user's profile Send private message
offshore
PostPosted: Tue Mar 23, 2004 9:39 am    Post subject: Reply with quote

Master

Joined: 20 Jun 2002
Posts: 222

I haven't dove into the world of distribution lists yet, but I will tell you what I know about clustering and message redirection.

Quote:
As soon as it finds out that there is a problem with the third instance of B, it distributes messages to the first two instances only.


For this to work the cluster queues will have to be defined with DEFBIND(NOTFIXED). This will allow MQ to manipulate the messages <in SYSTEM.CLUSTER.TRANSMIT.QUEUE> that were destined for the 3rd instance of "B"/QMGR3 and redirect it to another available QMGR that also hosts "B"

*Note when you defined a QL the default valued o DEFBIND is OPEN.*

Or if the application does a put it does a MQPUT1 this will always act if DEBIND(NOTFIXED) is specified.

Another good source of info is
1) WebSphere MQ Queue Manager Clusters manual
2) WebSphere MQ for z/OS in Parallel Sysplex Environment.
CH. 7 specifically deals w/ clustering.

HTH
Back to top
View user's profile Send private message Send e-mail
Display posts from previous:   
Post new topic  Reply to topic Page 1 of 1

MQSeries.net Forum Index » Clustering » What is failover, maybe that's not what i want.
Jump to:  



You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
Protected by Anti-Spam ACP
 
 


Theme by Dustin Baccetti
Powered by phpBB © 2001, 2002 phpBB Group

Copyright © MQSeries.net. All rights reserved.