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MQSeries.net Forum IndexGeneral IBM MQ SupportProblems with RDQM setup MQ 9.2.0.0 on CentOS and RHEL 7.8

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fjb_saper
PostPosted: Tue Sep 01, 2020 10:39 am Post subject: Reply with quote

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Joined: 18 Nov 2003
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@exerk
Why 3 replication sets (9 IPS) instead of one set (3 IPS) with rotating primary secondary and replication ??
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exerk
PostPosted: Tue Sep 01, 2020 11:10 am Post subject: Reply with quote

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Joined: 02 Nov 2006
Posts: 6191

This was a Proof-of-Concept I set up over two years ago so I followed the KC faithfully:

Quote:
The rdqm.ini file gives the IP addresses for all of the nodes in the Pacemaker cluster. You can specify that the Pacemaker cluster uses one, two, or three IP addresses. The interface that is used for synchronous data replication is named the 'replication interface'. The interface must have sufficient bandwidth to support replication requirements given the expected workload of all the RDQMs running in the HA Group. The primary and secondary interfaces are used for the Pacemaker to monitor the system, but Pacemaker can use the replication interface for this purpose, if required.


I'm not sure what you mean by "...rotating primary secondary and replication...", sorry.
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fjb_saper
PostPosted: Wed Sep 02, 2020 4:57 am Post subject: Reply with quote

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exerk wrote:

I'm not sure what you mean by "...rotating primary secondary and replication...", sorry.


Meaning that you have 3 IPS as primary, secondary and replication
Meaning that you define 3 qmgrs QM1 QM2 QM3
and preffered node is
QM1 primary
QM2 secondary
QM3 replication


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crashdog
PostPosted: Wed Sep 02, 2020 5:04 am Post subject: Reply with quote

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Joined: 02 Apr 2017
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That's not really how it works... You have 3 nodes (VMs). Basically you only need two network cards per node, one for the floating ip and one for the replication.
The primary and alternate nics are only for the heartbeat.
The number of queue managers per node is not limited. (it used to be limited to 10 and IBM's RDQM performance tests use up to 10 qmgrs).

Cheers,
Gerhard
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fjb_saper
PostPosted: Wed Sep 02, 2020 5:42 am Post subject: Reply with quote

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crashdog wrote:
That's not really how it works... You have 3 nodes (VMs). Basically you only need two network cards per node, one for the floating ip and one for the replication.
The primary and alternate nics are only for the heartbeat.
The number of queue managers per node is not limited. (it used to be limited to 10 and IBM's RDQM performance tests use up to 10 qmgrs).

Cheers,
Gerhard

Thanks for enlightening me. I naively thought that one network card could handle both the node's ip and the floating ip...
I understand the use of an alternate card for the heartbeat.

So if I understand this right Exerk is using 3 network cards
1 for the primary traffic
1 for the heartbeat traffic
1 for the replication traffic.

Please correct me if I misunderstood this set up


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crashdog
PostPosted: Wed Sep 02, 2020 5:56 am Post subject: Reply with quote

Acolyte

Joined: 02 Apr 2017
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you got it
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fjb_saper
PostPosted: Wed Sep 02, 2020 12:06 pm Post subject: Reply with quote

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crashdog wrote:
you got it

I was just a little bit surprised because usually each of those cards would be in a different subnet...
1 subnet for primary traffic
1 subnet for heartbeat
1 subnet for replications

And Exerk had them all on the same subnet... not that there's anything wrong with that...
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exerk
PostPosted: Thu Sep 03, 2020 10:04 am Post subject: Reply with quote

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fjb_saper wrote:
...And Exerk had them all on the same subnet... not that there's anything wrong with that...

It was a test installation Proof-of-Concept in a VMWare environment - not worth the hassle of creating a 'full' network infrastructure just to test out the mechanics of RDQM
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