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Online backup of MQ

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Posted: Fri Nov 05, 2004 5:15 am Post subject: Online backup of MQ

Acolyte

Joined: 19 Mar 2004
Posts: 70

Hi everyone!
We are wondering if it is possible to take online backup of MQ and if so how? Given that we only have persistent messages on a Qmgr with linear logging.

Any advice is greatly appreciated.

Regards
EB

PGoodhart

Posted: Fri Nov 05, 2004 5:17 am Post subject:

Master

Joined: 17 Jun 2004
Posts: 278
Location: Harrisburg PA

If you search the forum you will fine reams of information on this.
There is no such thing as a "supported" running backup.
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Patrick Goodhart
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Albator

Posted: Fri Nov 05, 2004 1:50 pm Post subject:

Voyager

Joined: 04 Mar 2004
Posts: 75
Location: Toronto, Canada

I think IBM recommends the following to get a proper backup (media and system backups):

1. Stop all channels
2. Perform rcdmqimg
3. shutdown queue manager
4. End listener
5. backup MQM folder on tape
6. Restart queue manager
7. Restart listeners
8. Restart the channels

csmith28

Posted: Fri Nov 05, 2004 2:14 pm Post subject:

Grand Master

Joined: 15 Jul 2003
Posts: 1196
Location: Arizona

If all you want is a backup of your MQManagers download the saveqmgr utility in support pack MS03 on the IBM Website.

This script will save a copy of all the objects that have been created on the named MQMGR.

Code:

# saveqmgr -m QMGRNAME -f OutPutFileName.bak.txt

I usually save that and a copy of the /var/mqm/mqs.ini if it has been modified and the /var/mqm/qmgrs/MQMGR/qm.ini file on a remote server.

In my personal experience this has been adequate to recover from a catastrophic failure as long as you have the WMQ installation image and a backup of any ServicePacks/APAR's you have installed.

I know I will probably get flamed a little about this but in most cases if there is a Hardware failure or some other catastrophic failure the TimeToLife for the messages (as in the amount of time that the messages are useful to the application) expires by the time service can be restored rendering any backup of the /var/mqm/log/QMGR/active or the /var/mqm/qmgrs/QMGR/queues directories insignifigant.

Disclaimer: I know this does not apply to all scenarios.
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fjb_saper

Posted: Fri Nov 05, 2004 3:13 pm Post subject:

Grand High Poobah

Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY

csmith28 wrote:

the TimeToLife for the messages expires by the time service can be restored

This is essentially true in a request response scenario. However if you are in a garanteed once only delivery scenario with datagrams (send and forget) you will want to use the Logs to recover whatever you can. Your messages would be persistent with no expiry time.

This is why it is prudent to have the queues and the logs on different file systems. If one gets corrupted you can always count on the other to recover.

Enjoy

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