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| Max Channnes reached - create new QM or create new Channel |
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| thravi |
 Posted: Wed Dec 21, 2005 11:34 am Post subject: Max Channnes reached - create new QM or create new Channel |
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Novice
Joined: 16 Jul 2004
Posts: 13
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Hi,
We have one QM with around 15 queues in it ( Client server setup - client is on AppServer machine, Server is Message Server MQ server installation ). Three Application are using these queues. 6 queues are being used by only one of these 3 applications. We are getting MaxChannels reached error. This is in production and we cannot increase QM attributes and restart it as it will take time to get downtime approved for the other 2 critical applications. I am thinking of below 2 scenarios. Please suggest if any is possible and which would be a better one.
1. Create another QM for that single application which can be brought down. Stop all the listener ports that application is using.
2. There is only one pair of SVRCONN and CLTCONN channels now. I am thinking of creating one more pair and use them for that failing application only because i can change that servers configuration and restart it. Would this help because still the max channels would be the same. is that number for every channel pair or for all the channels in the QM
3. Please suggest any other if possible
I am sure that application is the one causing the problem because listener ports used by those application are only stopping and causing the WebSphere Application server console to hang when I try to start it.
Thanks,
Ravi. |
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| jefflowrey |
| Posted: Wed Dec 21, 2005 12:19 pm Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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Having more SVRCONNs won't change the fact that too many channels are being opened.
Your wisest, safest, best choice is to troubleshoot to identify why you are reaching MaxChannels.
If it is a business necessity, then you can easily justify the short downtime to restart the QM.
If it is an application doing something wrong, then clearly they need to fix that rather than incur a business outage for the other applications so that you can put in place a work-around.
If it is a configuration in WAS that is at fault (someone increased the max connections on the MDB listener port), then that should be corrected.
_________________
I am *not* the model of the modern major general. |
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| fjb_saper |
| Posted: Wed Dec 21, 2005 4:12 pm Post subject: |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY
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As well having each application use a different SVRCONN channel will help you.
You can force shut down the SVRCONN that is running amok because of a network problem or because the app does not close it's connections properly.
This will allow you to keep the other apps running. It will not alleviate as Jeff said the fact that you are hitting the max channel mark.
You do need to investigate as to which app is making this event happen, and as well check the network connectivity. We hit on that problem when the network went down. The apps kept connecting, then loosing the connection due to network problems and connecting again... thus exhausting the number of available connections.
A simple display status on the channel or queues will show you what is going on.
Enjoy  |
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| csaunders |
| Posted: Thu Dec 22, 2005 11:21 am Post subject: |
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Acolyte
Joined: 27 Mar 2003
Posts: 64
Location: Arlington, Va
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| fjb_saper wrote: |
As well having each application use a different SVRCONN channel will help you.
You can force shut down the SVRCONN that is running amok because of a network problem or because the app does not close it's connections properly.
This will allow you to keep the other apps running. It will not alleviate as Jeff said the fact that you are hitting the max channel mark.
You do need to investigate as to which app is making this event happen, and as well check the network connectivity. We hit on that problem when the network went down. The apps kept connecting, then loosing the connection due to network problems and connecting again... thus exhausting the number of available connections.
A simple display status on the channel or queues will show you what is going on.
Enjoy |
we are running into these network problems as well, how did you guys resolve? Did you set KeepAlive to yes? Did you add a channel just for that
application? The network we are running on goes up and down alot, unfortunatley... |
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| fjb_saper |
| Posted: Thu Dec 22, 2005 11:59 am Post subject: |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY
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There is no solution to the network problem. They will happen and your channels will max.
The workaround is:
a) fix the network problem
b) force shutdown the corresponding channel
c) restart the corresponding channel
Enjoy  |
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