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| 4everfsu |
 Posted: Mon Feb 25, 2008 3:55 pm Post subject: Question about setting up full repos qmanagers in a non |
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Apprentice
Joined: 17 Jan 2008
Posts: 34
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cluster setup.
I know you need at least two full repos qmanagers in a cluster, can you have more then two and would that be wise say from a cost standpoint,etc?
Also if non clustered qmanagers are already defined, say on aix or mvs, what needs to be done to take at least two existing qmanagers and make them full repos?
Is it wiser to have the full repos on mvs vs aix?
Thanks |
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| bruce2359 |
| Posted: Mon Feb 25, 2008 4:09 pm Post subject: |
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Poobah
Joined: 05 Jan 2008
Posts: 9470
Location: US: west coast, almost. Otherwise, enroute.
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| Quote: |
| ... can you have more then two ? |
Yes.
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| and would that be wise say from a cost standpoint,etc? |
No additional $ cost for being a full repos. A very slight increase in processor utilization.
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| Also if non clustered qmanagers are already defined, say on aix or mvs, what needs to be done to take at least two existing qmanagers and make them full repos? |
A cluster sender channel to a full repos, a cluster receiver channel, and altering the qmgr CLUSTER attribute to name the cluster it is to be a full repository for.
| Quote: |
| Is it wiser to have the full repos on mvs vs aix? |
Wiser? One of the often-cited rules is to place full repositories on your most reliable platforms. Full repositories on both platforms would be ok.
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| jefflowrey |
| Posted: Mon Feb 25, 2008 4:39 pm Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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Ian Vanstone is on record in saying that every cluster should have full repositories numbering exactly two.
Neither shall you count to one, unless you therefore count to two, nor shall you count to five, THREE SIR, THREE.
Every cluster should have two FRs. It makes things less reliable if you use one, and more confusing if you use three or more.
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| bruce2359 |
| Posted: Mon Feb 25, 2008 4:47 pm Post subject: |
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Poobah
Joined: 05 Jan 2008
Posts: 9470
Location: US: west coast, almost. Otherwise, enroute.
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| Every cluster should have two FRs. It makes things less reliable if you use one, and more confusing if you use three or more. |
Reliability vs. confusion... hmmm.
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| PeterPotkay |
| Posted: Mon Feb 25, 2008 5:42 pm Post subject: |
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Poobah
Joined: 15 May 2001
Posts: 7722
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There's a good discussion on the Vienna list serve where it seems to make sense that things can become unpredictable when you have more than 2 FRs.
If you have only 2 FRs and both go down you know your cluster can continute to work and you know that no cluster updates will happen until 1 of those FRs comes back.
If you have 3 FRs and 2 of them go down you might think that all the remaining PRs would somehow be connected to the 3rd remaining FR. Not true. A PR only ever connects to 2 FRs. In a cluster with 3 FRs where 2 FRs go away you will find yourself with some PRs still being connected to a live FR and others not. You now have a somewhat random status of cluster update capability.
Use 2 FRs per cluster. Period.
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Peter Potkay
Keep Calm and MQ On |
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| 4everfsu |
| Posted: Mon Feb 25, 2008 7:05 pm Post subject: |
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Apprentice
Joined: 17 Jan 2008
Posts: 34
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Quote:
Also if non clustered qmanagers are already defined, say on aix or mvs, what needs to be done to take at least two existing qmanagers and make them full repos?
A cluster sender channel to a full repos, a cluster receiver channel, and altering the qmgr CLUSTER attribute to name the cluster it is to be a full repository for.
I think the above is setting up a partial repo qmanager. Maybe I was not very clear so let me try this.
Say I have ten qmanagers defined, how do I take two of the ten qmanagers and make them full repos?
Thanks |
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| fjb_saper |
| Posted: Mon Feb 25, 2008 10:05 pm Post subject: |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY
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| 4everfsu wrote: |
Quote:
Also if non clustered qmanagers are already defined, say on aix or mvs, what needs to be done to take at least two existing qmanagers and make them full repos?
A cluster sender channel to a full repos, a cluster receiver channel, and altering the qmgr CLUSTER attribute to name the cluster it is to be a full repository for.
I think the above is setting up a partial repo qmanager. Maybe I was not very clear so let me try this.
Say I have ten qmanagers defined, how do I take two of the ten qmanagers and make them full repos?
Thanks |
The cluster manual is very clear about that: set their repos/reposnl attribute and create a manual cluster sender on each to the other.
That is enough.
Enjoy 
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| 4everfsu |
| Posted: Tue Feb 26, 2008 1:38 pm Post subject: |
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Apprentice
Joined: 17 Jan 2008
Posts: 34
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| Ok thanks I was going to ask how does a FR know about another FR qmanager and you answered my question if I am reading the last entry correctly, that is set the repo parameter and define sender cluster channels to the other FR. |
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| bruce2359 |
| Posted: Tue Feb 26, 2008 1:44 pm Post subject: |
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Poobah
Joined: 05 Jan 2008
Posts: 9470
Location: US: west coast, almost. Otherwise, enroute.
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Cluster setup and other cluster-related subjects are covered in the WMQ Queue Manager Clusters manual. The manual includes step-by-step how-to's.
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ב''ה
Lex Orandi, Lex Credendi, Lex Vivendi. As we Worship, So we Believe, So we Live. |
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| jefflowrey |
| Posted: Tue Feb 26, 2008 1:49 pm Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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Any queue manager knows about other FRs through manually defined clussdrs.
Any qmgr knows if it's a repository by repos() or reposnl().
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