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| frodo33 |
 Posted: Tue Dec 07, 2004 4:49 am Post subject: Reconfigure MQ Logging |
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Newbie
Joined: 07 Dec 2004
Posts: 9
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Hi experts,
i have a Queuemanager that is configured for linear logging. During the last half year we found out, that we do not need this persistence.
Is it possible to change the logging of an existing Queuemanager to circular logging ? If yes, what steps are needed?
Thanks in advance.
Thorsten |
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| Nigelg |
| Posted: Tue Dec 07, 2004 6:06 am Post subject: |
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Grand Master
Joined: 02 Aug 2004
Posts: 1046
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| No. To change from linear to circular logging the qmgr has to deleted and recreated. |
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| mq_abcd |
| Posted: Wed Dec 08, 2004 8:02 am Post subject: |
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Acolyte
Joined: 13 Jun 2004
Posts: 69
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I think we can do it in the following way
But i dont know the implications of this.
ensure that there are no messages on the queues
stop the channels and qmgr
move the log files to a some folder.
create a dummy qmgr with circular logging
copy back the log files to this folder
basically doing a cold start.
I'm just guessing this method.
Any gurus can correct me.
Shailu. |
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| Nigelg |
| Posted: Wed Dec 08, 2004 8:22 am Post subject: |
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Grand Master
Joined: 02 Aug 2004
Posts: 1046
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No, you have to recreate the qmgr. Yourprocedure is absolutely not supported by IBM.
You can save the qmgr objects using support pack MS63.
You will have to archive any msgs on the queues by getting them, storing them somewhere, and putting them back after the recreate. |
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| mq_abcd |
| Posted: Wed Dec 08, 2004 8:28 am Post subject: |
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Acolyte
Joined: 13 Jun 2004
Posts: 69
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| jefflowrey |
| Posted: Wed Dec 08, 2004 8:51 am Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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But that still doesn't mean it's "supported".
Use at your own risk.
Having procedures to recreate a queue manager is a Good Thing anyway.
_________________
I am *not* the model of the modern major general. |
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| csmith28 |
| Posted: Wed Dec 08, 2004 8:57 am Post subject: |
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Grand Master
Joined: 15 Jul 2003
Posts: 1196
Location: Arizona
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Note that in both of those threads it says that this way of doing it is not supported.
I found myself in a position in which I needed to increase the size of my active logs earlier this year.
I considered using the COLD BOOT process of creating a Dummy MQManager and copying the Dummy active directory over the top of the existing active directory. I even successfully tested the process on a LAB box but all things considered it was just as much if not more work and that process is not supported so if it blew up in my face I wouldn't be able to get IBM to support it. Except that if I had called IBM they would likely have told me to delete the MQManager and recreate it.
Just use MS03 saveqmgr to back up the objects on your existing MQManager. Make backups of your qm.ini file and SSL (if needed) Certs.
Have all the applications stopped. Then have all channels comming from any remote MQManagers Stopped and Reset.
Then stop your MQManager, delete it with dltmqm QMGR and re-create it.
Restore your qm.ini and Certs. Start the new QMGR. Start the command Server and use the saveqmgr output file to populate the new instance of the QMGR. Start your channels to the remote QMGR's. Start the applications. Validate.
_________________
Yes, I am an agent of Satan but my duties are largely ceremonial. |
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| WannaBeInAParker |
| Posted: Wed Dec 08, 2004 1:49 pm Post subject: |
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Voyager
Joined: 09 Dec 2003
Posts: 81
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frodo33,
When moving to circular logging, keep in mind that you will lose the ability to recover your objects should they get damaged. This may be an undesired side affect of ridding persistent logs.
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-WannaBe- |
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| csmith28 |
| Posted: Wed Dec 08, 2004 4:03 pm Post subject: |
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Grand Master
Joined: 15 Jul 2003
Posts: 1196
Location: Arizona
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| WannaBeInAParker wrote: |
frodo33,
When moving to circular logging, keep in mind that you will lose the ability to recover your objects should they get damaged. This may be an undesired side affect of ridding persistent logs. |
Not entirely true, if he uses saveqmgr (Support Pack MS03) to make backups of his MQManagers he can recover them from that backup but he will lose any messages that were in flight if/when the MQManager has a catastrophic failure that would require recovery.
It has been my experience that most applications that use MQSeries are request/response type applications who's messages have a limited time of life so for example if someone clicks on a link to request to see the current balance of a loan they have and MQSeries is not responding the application will time out the request in for the sake of argument 60 seconds. If the application is coded correctly it will throw a timeout message or  please try again later or some such.
In any instance in which there is a catastrophic failure of an MQManager involvling damaged objects, regardless of whether you are using Circular or Linear logging it will indeed take more than 60 seconds to recover.
It is also a good idea to keep backups of the qm.ini file and any Certs that were created for the MQManager.
_________________
Yes, I am an agent of Satan but my duties are largely ceremonial. |
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| WannaBeInAParker |
| Posted: Wed Dec 08, 2004 6:59 pm Post subject: |
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Voyager
Joined: 09 Dec 2003
Posts: 81
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csmith28,
Media recovery is lost when the queue manager is circular logged. I do not disagree that you can delete a damaged object and redefine the object. I am assuming (dangerous) that the user is sending persistent messages, since he/she is having an issue with Linear logs piling up (again reading into the situation here). I would not recommend your recovery solution for persistent messaging as there is a reason they are persistent, they cannot be lost.
I work in a financial institution where 1 message lost could mean millions of dollars, in our situation we take no chances when it comes to data. I completely understand that this is not the case everywhere.
I was simply pointing out that there are other things that need to be considered going from linear to circular logged queue managers.
-----Don't be too proud of this technological terror you've constructed. The ability to destroy a planet is insignificant next to the power of the Force.
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| csmith28 |
| Posted: Thu Dec 09, 2004 2:26 pm Post subject: Re: Reconfigure MQ Logging |
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Grand Master
Joined: 15 Jul 2003
Posts: 1196
Location: Arizona
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| frodo33 wrote: |
Hi experts,
i have a Queuemanager that is configured for linear logging. During the last half year we found out, that we do not need this persistence.
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_________________
Yes, I am an agent of Satan but my duties are largely ceremonial. |
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| WannaBeInAParker |
| Posted: Thu Dec 09, 2004 3:02 pm Post subject: |
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Voyager
Joined: 09 Dec 2003
Posts: 81
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persistence of logs because they stick around and do not overwrite one another for a very long time or persistence of messages?
I was guessing persistence of logs.
Could be messages. I am done with this one though. I look forward to further episodes!!!
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| Tibor |
| Posted: Fri Dec 10, 2004 2:11 am Post subject: |
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Grand Master
Joined: 20 May 2001
Posts: 1033
Location: Hungary
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| jefflowrey wrote: |
But that still doesn't mean it's "supported".
Use at your own risk.
Having procedures to recreate a queue manager is a Good Thing anyway. |
Jeff is right. However when Carla has a lot of queues with messages... backup all queues will be painful. I find this hacking a more convenient way. I had tried on our production qmgr without any problem one year ago  But I was prepared for recreating when logging doesn't work.
Another link: http://www.mqseries.net/phpBB2/viewtopic.php?t=6318
Hint: don't forget to save your OAM! (amqoamd ... -s)
Tibor |
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