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| kun.leeing |
 Posted: Wed Aug 07, 2013 6:53 pm Post subject: About Channel stoped abnormally and channels principle |
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Disciple
Joined: 27 Sep 2008
Posts: 171
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Hi masters,
I got a problem here. In our Qmgrs on windows, from time to time there are some certain channels (usually sender channels) go stopped or in a status of retrying.
But usually it can be fixed by themself, I mean that the channels can resume to normal status.
I wanna know about the principle of MQ Channels mechanism,eg, how does it process the unstability of network or how does MQ handle the heartbeat between both ways and in what situation it think that the STOP abnormally should be reported.
Thanks. |
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| bruce2359 |
| Posted: Wed Aug 07, 2013 7:40 pm Post subject: |
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Poobah
Joined: 05 Jan 2008
Posts: 9470
Location: US: west coast, almost. Otherwise, enroute.
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Do a bit of research. Download the WMQ Intercommunications manual. Look at channel attributes, like retry interval and retry count.
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ב''ה
Lex Orandi, Lex Credendi, Lex Vivendi. As we Worship, So we Believe, So we Live. |
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| SAFraser |
| Posted: Thu Aug 08, 2013 2:45 am Post subject: |
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Shaman
Joined: 22 Oct 2003
Posts: 742
Location: Austin, Texas, USA
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I would expect a channel in paused or retrying status to attempt to correct itself. Whether that is successful or not depends, I believe, on whether the queue manager can determine to its satisfaction that messages are accounted for. (Once and once-only assured delivery, blah blah.)
I am not familiar with any situation of a stopped channel that will restart itself. I am not familiar with a channel going to stopped state in the absence of human intervention. Perhaps there are situations where channels kill themselves, but I can't think of one right now.
In fact, we alert on a channel in retry or pause longer than ten minutes (giving the channels/situation a few minutes to auto-recover). But we do not alert on stopped channels at all. Only three human beings in our estate have rights to stop a channel, so a stopped channel is intentional and rare.
Hope this helps! |
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| PeterPotkay |
| Posted: Thu Aug 08, 2013 4:17 am Post subject: |
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Poobah
Joined: 15 May 2001
Posts: 7722
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| SAFraser wrote: |
I am not familiar with any situation of a stopped channel that will restart itself. |
They won't. They'll need to be explicitly restarted by something or someone.
| SAFraser wrote: |
I am not familiar with a channel going to stopped state in the absence of human intervention. Perhaps there are situations where channels kill themselves, but I can't think of one right now.
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Channels will go into a STOPPED state for numerous reasons, including but not limited to their Long Retry Count being exhausted, needing to process a persistent message but the receiving QM not being able to accept it for whatever reason, etc. Actually, I'm not sure if there are any other reasons off the top of my head....
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Peter Potkay
Keep Calm and MQ On |
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| PeterPotkay |
| Posted: Thu Aug 08, 2013 4:22 am Post subject: Re: About Channel stoped abnormally and channels principle |
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Poobah
Joined: 15 May 2001
Posts: 7722
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| kun.leeing wrote: |
I wanna know about the principle of MQ Channels mechanism,eg, how does it process the unstability of network or how does MQ handle the heartbeat between both ways and in what situation it think that the STOP abnormally should be reported.
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Print two copies of the document in this support pack:
http://www-01.ibm.com/support/docview.wss?uid=swg24006699
One copy for home and one for work, and read it over and over. 
If you are an MQ Admin and have to manage any MQ channels you will do yourself no bigger favor than understanding how channels work and how to keep them running. This doc is a huge help in getting there.
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Peter Potkay
Keep Calm and MQ On |
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| hughson |
| Posted: Thu Aug 08, 2013 6:14 am Post subject: Re: About Channel stoped abnormally and channels principle |
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Padawan
Joined: 09 May 2013
Posts: 1959
Location: Bay of Plenty, New Zealand
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| kun.leeing |
| Posted: Thu Aug 08, 2013 11:01 pm Post subject: |
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Disciple
Joined: 27 Sep 2008
Posts: 171
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| I really wanna download this doc but I cannot get from the URL, it seems broken. |
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| smdavies99 |
| Posted: Thu Aug 08, 2013 11:43 pm Post subject: |
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Jedi Council
Joined: 10 Feb 2003
Posts: 6076
Location: Somewhere over the Rainbow this side of Never-never land.
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I just clicked on the link and it worked for me. Perhaps your firewall is blocking access to www-01.ibm.com
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WMQ User since 1999
MQSI/WBI/WMB/'Thingy' User since 2002
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Every time you reinvent the wheel the more square it gets (anon). If in doubt think and investigate before you ask silly questions. |
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| hughson |
| Posted: Fri Aug 09, 2013 12:39 am Post subject: |
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Padawan
Joined: 09 May 2013
Posts: 1959
Location: Bay of Plenty, New Zealand
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| kun.leeing wrote: |
| I really wanna download this doc but I cannot get from the URL, it seems broken. |
Google
MD0C MQ
and the first hit will be
IBM MD0C: WebSphere MQ - Keeping Channels Up and Running
That's the link you want.
Cheers
Morag
_________________
Morag Hughson @MoragHughson
IBM MQ Technical Education Specialist
Get your IBM MQ training here!
MQGem Software |
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| kun.leeing |
| Posted: Fri Aug 09, 2013 12:57 am Post subject: |
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Disciple
Joined: 27 Sep 2008
Posts: 171
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| hughson |
| Posted: Fri Aug 09, 2013 1:13 am Post subject: |
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Padawan
Joined: 09 May 2013
Posts: 1959
Location: Bay of Plenty, New Zealand
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Link works for me. I suspect you'll need to get that looked at by your network or firewall people. Maybe you'll be able to access it when you get home (often the way).
Much to my incredulity, I find that there are other hosted copies (back-dated ones in most cases) on various other websites all over the world. If you google, "Keeping Channels Up and Running" (with the quotes) you will find quite a number of hits. Maybe one of those unofficial back-dated sites will work for you. However, none of them had the up-to-date version so I still think you should work out what is blocking you from the official support pac site. And anyway, supportpacs are useful, you don't want to be missing out.
Cheers
Morag
_________________
Morag Hughson @MoragHughson
IBM MQ Technical Education Specialist
Get your IBM MQ training here!
MQGem Software |
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