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| Failovering and load balancing at the same time. |
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| jfweemaes |
 Posted: Fri Oct 07, 2005 12:43 pm Post subject: Failovering and load balancing at the same time. |
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Newbie
Joined: 06 Oct 2005
Posts: 6
Location: Montreal
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Hello,
Is this possible to get a complete solution of failovering and load balancing at the same time within a MQ 5.3 2-units cluster environment?
I mean, is there a way to setup a MQ workload management algorithm to perform that type of solution ?
Thanks! |
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| EddieA |
| Posted: Fri Oct 07, 2005 1:34 pm Post subject: |
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Jedi
Joined: 28 Jun 2001
Posts: 2453
Location: Los Angeles
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| Quote: |
| failovering and load balancing |
Fail over requires some form of HA, depending on your platform
Load balancing uses MQ Clustering.
They are not the same thing. And one cannot do the work of the other.
Cheers,
_________________
Eddie Atherton
IBM Certified Solution Developer - WebSphere Message Broker V6.1
IBM Certified Solution Developer - WebSphere Message Broker V7.0 |
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| hopsala |
| Posted: Fri Oct 07, 2005 4:44 pm Post subject: |
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Guardian
Joined: 24 Sep 2004
Posts: 960
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As EddieA said, you cannot construct the complete scheme without some kind of hardware-failover solution (MSCS, HACMP etc); if you use MQ Clusters only, when one of them drops the other will indeed take over all traffic, but all messages that were retained in the QM that's down, will wait in queues and not be serviced.
To implement a full scale failover+workload solution do the following - create two QMs on two shared drives called QM1 & QM2, so that your setup will look like this:
Machine A: QM1 up, QM2 down
Machine B: QM1 down, QM2 Up
Both QMs should be members of the same MQ cluster, with two instances of the same cluster queue.
In case machine A crashes (or shutdown for maintenance) you failover QM1 to machine B, and vice versa; the MQ cluster will keep everything flowing automatically to the availble QMs so that failover will little affect your buisness processes.
Note that if either QM crashes, while it's down you still can't get the retained messages in it's queues, but the idea is that it is fairly easy to failover it to the other machine; if the QM itself is botched, then traffic flows on, but you'll have to fix the qm to get to these messages.
Of course there are a few technicalities to sort out (hamvmqm, virtual ip, how to set up a shared drive etc) but search this site and read the manuals will kick you off to a good start. |
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| Anirud |
| Posted: Mon Oct 10, 2005 8:29 am Post subject: |
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Master
Joined: 12 Feb 2004
Posts: 285
Location: Vermont
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| hopsala, did you mean to say 2 qmgrs with same name in the same cluster? or, I might have misread your solution... |
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| hopsala |
| Posted: Mon Oct 10, 2005 9:01 am Post subject: |
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Guardian
Joined: 24 Sep 2004
Posts: 960
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| Anirud wrote: |
| hopsala, did you mean to say 2 qmgrs with same name in the same cluster? or, I might have misread your solution... |
You are probably referring to:
| hopsala wrote: |
Machine A: QM1 up, QM2 down
Machine B: QM1 down, QM2 Up
Both QMs should be members of the same MQ cluster, with two instances of the same cluster queue. |
Note that I said *Both QMs*, meaning there are only two QMs in the entire scenario. When I say "Machine A: QM1 up" I mean it's the same QM1 as in "Machine B: QM1 down" - by "down" I meant "a QM that is down since it is currently up on the other machine".
Apologies for the incoherency, hope that clears it up... |
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| Anirud |
| Posted: Mon Oct 10, 2005 9:49 am Post subject: |
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Master
Joined: 12 Feb 2004
Posts: 285
Location: Vermont
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hopsala,
no worries. maybe it was me. I didn't understand what you meant.
Thanks for clarifying.
Regards,
Anirud. |
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