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MQSeries.net Forum IndexGeneral IBM MQ Supportqmgrs with same name but different versions

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Heba_MQ
PostPosted: Tue May 24, 2022 9:50 am Post subject: qmgrs with same name but different versions Reply with quote

Apprentice

Joined: 19 Apr 2020
Posts: 35

Dear All

is it possible to create qmgrs with same name on the same machine but with different mq installations

we have qmgr QM1 on aix machine installation1 with MQ version 7.5
the installation path is /usr/mqm and it is default installation

I installed version 9.2 on /opt/IBM/MQ and the installation path becomes /opt/IBM/MQ/usr/mqm and it took installation2

I used /opt/IBM/MQ/usr/mqm/bin/crtmqm QM2 - and it was associated with installation1 although IBM mentioned it should be associated with the installation issued the crtmqm command which is Installation2 ? any idea why ?

Also can I create qmgr with same name QM1 and associate it with Installation2 ?

Thanks
Heba
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gbaddeley
PostPosted: Tue May 24, 2022 3:48 pm Post subject: Reply with quote

Jedi

Joined: 25 Mar 2003
Posts: 2348
Location: Melbourne, Australia

Quote:
is it possible to create qmgrs with same name on the same machine but with different mq installations

I don't think /var/mqm/mqs.ini will allow duplicate queue manager stanza names, even if the InstallationName was different for each one.

To avoid any possible confusion, queue manager names should be unique across an entire network.
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Glenn
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hughson
PostPosted: Wed May 25, 2022 12:29 am Post subject: Reply with quote

Padawan

Joined: 09 May 2013
Posts: 1757
Location: Bay of Plenty, New Zealand

It is not possible. Remember that each queue manager has a directory in the MQ data directory under the qmgrs folder. There is only one data directory regardless of how many installations so there cannot be two folders with the same name.

The installation path is different from the data path. When you have multiple installations then there are different installation paths, but there is always only one data path.

In the error you mention with the crtmqm command, could you show us the full error message you saw so we can comment further?

Cheers,
Morag
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bruce2359
PostPosted: Wed May 25, 2022 3:59 am Post subject: Re: qmgrs with same name but different versions Reply with quote

Poobah

Joined: 05 Jan 2008
Posts: 9168
Location: US: west coast, almost. Otherwise, enroute.

Heba_MQ wrote:
is it possible to create qmgrs with same name on the same machine but with different mq installations

Do you mean "in the same LPAR" or "in the same o/s instance? Machine is not a precise term.

You can have the same qmgr name in different LPARs, different o/s instances. Let confusion reign.

If memory serves, v5.3 introduced QMID the internally generated unique name of the queue manager - within this unique o/s instance, composed of qmgrname.datatimestamp.
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fjb_saper
PostPosted: Wed May 25, 2022 11:32 am Post subject: Re: qmgrs with same name but different versions Reply with quote

Grand High Poobah

Joined: 18 Nov 2003
Posts: 20569
Location: LI,NY

Heba_MQ wrote:
Dear All

is it possible to create qmgrs with same name on the same machine but with different mq installations

we have qmgr QM1 on aix machine installation1 with MQ version 7.5
the installation path is /usr/mqm and it is default installation

I installed version 9.2 on /opt/IBM/MQ and the installation path becomes /opt/IBM/MQ/usr/mqm and it took installation2

I used /opt/IBM/MQ/usr/mqm/bin/crtmqm QM2 - and it was associated with installation1 although IBM mentioned it should be associated with the installation issued the crtmqm command which is Installation2 ? any idea why ?

Also can I create qmgr with same name QM1 and associate it with Installation2 ?

Thanks
Heba

Before creating the qmgr in 9.2 did you source the environment using setmqenv ??
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gbaddeley
PostPosted: Wed May 25, 2022 3:14 pm Post subject: Reply with quote

Jedi

Joined: 25 Mar 2003
Posts: 2348
Location: Melbourne, Australia

hughson wrote:
It is not possible. Remember that each queue manager has a directory in the MQ data directory under the qmgrs folder.

By default, yes. However each qmgr can have its own setting for Prefix and DataPath in mqs.ini. These allow each qmgr to have separate data, eg. on HA cluster disks. The recovery logs can also be on separate disks, as set in each qm.ini. Note that there is another technique for doing HA config, using the default directories, with symbolic links for each qmgr to the physical directory.

Something that may prevent duplicate qmgr names on the same server is the /var/mqm/sockets directory. This has sub directories for each qmgr name.
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Glenn
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PeterPotkay
PostPosted: Thu May 26, 2022 5:25 pm Post subject: Reply with quote

Poobah

Joined: 15 May 2001
Posts: 7706

Heba_MQ,
What are you trying to accomplish? Maybe there is a better way.
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Andyh
PostPosted: Fri May 27, 2022 3:59 am Post subject: Reply with quote

Master

Joined: 29 Jul 2010
Posts: 204

gbaddeley wrote:
Quote:
is it possible to create qmgrs with same name on the same machine but with different mq installations

I don't think /var/mqm/mqs.ini will allow duplicate queue manager stanza names, even if the InstallationName was different for each one.

To avoid any possible confusion, queue manager names should be unique across an entire network.


IBM documents the AMQ_MQS_INI_LOCATION as one of "A list of server and client environment variables intended for customer use", but there's minimal information on how this environment variable might be used.
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bruce2359
PostPosted: Fri May 27, 2022 6:43 am Post subject: Reply with quote

Poobah

Joined: 05 Jan 2008
Posts: 9168
Location: US: west coast, almost. Otherwise, enroute.

gbaddeley wrote:
Something that may prevent duplicate qmgr names on the same server is the /var/mqm/sockets directory. This has sub directories for each qmgr name.

In the interest of precision and clarity: "server" is imprecise. (And, "server" appears widely in IBM MQ doc.) The OP used the similarly imprecise term "machine".
I suspect the OP is asking if it's possible to have multiple qmgrs with the same name in one o/s instance.
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Last edited by bruce2359 on Fri May 27, 2022 8:25 am; edited 1 time in total
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Heba_MQ
PostPosted: Fri May 27, 2022 7:54 am Post subject: Reply with quote

Apprentice

Joined: 19 Apr 2020
Posts: 35

Many Thanks for all replies -

The error that I got is that qmgr already exists

the people I am working with wanted to have two version of MQ 7.5 and 9.2 and have two qmgrs with the same name and keep one up at a time and test
(as they did not want to change the setting from the WebSphere using the MQ objects )...

but any idea why when I created the QM2 with the full path of the bin dir of installation2, it was also created with Installation1 ?

Many Thanks friends for your help

Heba
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hughson
PostPosted: Sun May 29, 2022 6:57 pm Post subject: Reply with quote

Padawan

Joined: 09 May 2013
Posts: 1757
Location: Bay of Plenty, New Zealand

Heba_MQ wrote:
The error that I got is that qmgr already exists

Which is accurate

Heba_MQ wrote:
the people I am working with wanted to have two version of MQ 7.5 and 9.2 and have two qmgrs with the same name and keep one up at a time and test
(as they did not want to change the setting from the WebSphere using the MQ objects )...

Perhaps we can instead help you with the settings they are worried about so that you can use two differently named queue managers. Can you expand on what they needed to change and perhaps we can provide alternative ways of running that would allow easy switching.

Heba_MQ wrote:
but any idea why when I created the QM2 with the full path of the bin dir of installation2, it was also created with Installation1 ?

I assume your currently set MQ environment (setmqenv) was pointing at Installation1.

Cheers,
Morag
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