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| smeunier |
 Posted: Thu Jun 08, 2006 12:08 pm Post subject: WebSphere Edge Server as load balancer to MQ? |
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Partisan
Joined: 19 Aug 2002
Posts: 305
Location: Green Mountains of Vermont
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I'm building and MQ environment which needs to be in the 99.999% availibility range. To do do so, I will have two servers partitioned each with multiple LPARS. The LPARS will be HACMP configured and the queue managers will be clustered Thus:
Server1 - LPAR1(MQA) LPAR2(MQB-Backup)
Server2 - LPAR1(MQB) LPAR2(MQA - Backup)
The X( cross over) configuration should cover the extreme availability circumstances. I would like to add Loadbalancing to the two servers to further enhance distrubution of workload and availability by adding a Linux server runing Websphere Edge Server (network dispatching) so client connectivity will be distrubuted across the ACTIVE/ACTIVE configuration described above. My question is: Can this be done? I cannot seem to find information on whether the Edge load balancing can be used in a MQ environment for client connectivity. Is this possible and has anyone any experience in doing this. Can you point me somewhere or describe breifly how a MQ client connects in this environment anf how the connection gets handed off to the MQ Manager? |
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| jefflowrey |
| Posted: Thu Jun 08, 2006 12:15 pm Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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You can't use any sort of network loadbalancing for MQ Client connections, or even regular MQ channels.
Each side of an MQ channel keeps track of the number of messages that it has sent and received (even client connection channels). If the two sides disagree, the connection is stopped.
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I am *not* the model of the modern major general. |
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| markt |
| Posted: Thu Jun 08, 2006 12:21 pm Post subject: |
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Knight
Joined: 14 May 2002
Posts: 508
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| Network loadbalancing is fine for client connections, as long as you're not using the XA client. It cannot be used for qmgr/qmgr channels. |
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| jefflowrey |
| Posted: Thu Jun 08, 2006 12:24 pm Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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Really?
I'm sure you mean that it's not okay if the load balancer moves the connection once it's been established?
I guess I learned something today.
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I am *not* the model of the modern major general. |
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| markt |
| Posted: Thu Jun 08, 2006 12:44 pm Post subject: |
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Knight
Joined: 14 May 2002
Posts: 508
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| connection == socket ... if the socket breaks, so does the hconn. so you have to go back through MQCONN again, which is when rebalancing might happen. although there some technologies that move active sockets to different systems, that's not how regular loadbalancers work. |
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| smeunier |
| Posted: Fri Jun 09, 2006 4:49 am Post subject: |
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Partisan
Joined: 19 Aug 2002
Posts: 305
Location: Green Mountains of Vermont
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Trying to balance out the replies here. MQ Server to server loadbalancing cannont be contained with a network load balancer, but MQ Client connectivity can through SVRCONN and/or CLNTCONN channels?
Is this a correct statement? If so could you share a few words on how a MQ Client application connects to a load balancer server and how that connection gets offloaded(or redirected) to a MQ QMGR.
---------------> QMGR A
Application ----->Loadbalancer Server -
---------------> QMGR B
This messes with my head, because on a client connection, you basically specify some system affinity(hostname,port,qmgr). So unless the loadbalancer server, does a look up and redirection to a different server ththen feeds that back to the Client and say no, you are connecting here instead................ just a little vodoo magic happening, I need to get my head around. Any words would help. |
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| PeterPotkay |
| Posted: Fri Jun 09, 2006 3:28 pm Post subject: |
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Poobah
Joined: 15 May 2001
Posts: 7722
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u don't specify the QM name
make the port # the same on both QMs
aim your connection at an IP that gets u to the load balancer and let the the load balancer decide which MQ server u end up connecting to.
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Peter Potkay
Keep Calm and MQ On |
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