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| Shalini |
 Posted: Tue Sep 28, 2004 4:24 am Post subject: Cluster Queue behaviour |
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Master
Joined: 30 Apr 2002
Posts: 224
Location: India
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Hi All,
Would like to know more about the behaviors of Cluster queue.
For a Partial QM
1) If a queue manager holding a cluster queue goes down then the image of that cluser queue should vanish in all other QM of cluster or not ???
For a Full Repos QM
2) If a queue manager holding a cluster queue goes down then the image of that cluser queue should vanish in all other QM of cluster or not ???
3) If there is network issues between the Partial and Full repos queue manager will the image of cluster queue should vanish or not ????
4) If the channel between the full Repos and Partial repos is retrying or stopped will the image queue of cluster vanish
Sorry to use image cluster Q as its not IBM MQ Cluster term, actually I don’t know better way to explain the situation and I don’t know how do you tell "image of cluster queue" in IBM MQ Cluster terms.
Thanks in Advance
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| Nigelg |
| Posted: Tue Sep 28, 2004 4:37 am Post subject: |
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Grand Master
Joined: 02 Aug 2004
Posts: 1046
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| The 'image of the cluster queue' never vanishes, if you mean is the cluster queue still visible when executing runmqsc commands. It is still valid to put msgs to a cluster queue if the queue is known to the cluster qmgr even if the qmgr is not running. |
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| Shalini |
| Posted: Tue Sep 28, 2004 4:54 am Post subject: |
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Master
Joined: 30 Apr 2002
Posts: 224
Location: India
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Hi Nigelg,
Thanks for your reply.
Do you mean to say that If a QM holding a cluster queue gone down, then other QM of same cluster can put message into the image of the cluster queue.
In such cases where will be the messages as the original physical cluster queue does not exsists (as its holding QM is down) how a image can hold the messages 
Really confused
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| Nigelg |
| Posted: Tue Sep 28, 2004 5:27 am Post subject: |
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Grand Master
Joined: 02 Aug 2004
Posts: 1046
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| The messages remain on the cluster xmitq of the sending qmgr until the qmgr starts again. |
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| Shalini |
| Posted: Tue Sep 28, 2004 9:00 pm Post subject: |
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Master
Joined: 30 Apr 2002
Posts: 224
Location: India
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Hi,
Correct me, if I am wrong.
However the image cluster queue and Physical cluster queue are the same object residing in different QM
As I create the Physical cluster queue in a QM it appears in all other QM of the cluster but if the physical cluster Queue itself is not there (as its QM is down) why the image appears ?????
I was in the impression that if the Physical Cluster Queue disappears as QM (holding physical cluster q) is down, so its image should disappear in all other QM, then only we have queue level failover.
Regards,
Shalini |
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| siliconfish |
| Posted: Tue Sep 28, 2004 11:19 pm Post subject: |
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Master
Joined: 12 Aug 2002
Posts: 203
Location: USA
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Shalini
If you introduce a queue into a cluster, all the queue managers in the cluster will get to know about that queue (when a message is put for the first time) and stores that information in the SYSTEM.CLUSTER.REPOSITORY.QUEUE so that the queue managers will use that information when a message is put to the cluster queue.
So if the actual queue manager is down still the info about the cluster queue is available to all the other queue managers in the cluster.
You can go through the cluster manual to get more info. |
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