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| ajith.rajan |
 Posted: Thu Apr 27, 2006 2:14 am Post subject: Channel Sequence Numbers |
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Apprentice
Joined: 14 Sep 2004
Posts: 30
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Hi
I have a query regarding the reset of channel sequence numbers.
Is it possible to reset the channel sequence numbers of both sender and the receiver channels??? Or is this some thing specific to a particular type of channels alone.
Kindly help.
Thanks
Ajith |
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| fjb_saper |
| Posted: Thu Apr 27, 2006 2:28 am Post subject: |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY
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The manual says that if you reset the sequence number at the sender end of a channel it resets it as well at the receiving end.
Enjoy 
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MQ & Broker admin |
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| ajith.rajan |
| Posted: Thu Apr 27, 2006 2:36 am Post subject: |
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Apprentice
Joined: 14 Sep 2004
Posts: 30
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Is vice-versa true as well??
This is because, we are doing MQ Server migration next week and we do not want to disturb our suppliers MQ configuration. Hence, in this scenario, in case if we have problems starting the channels due to the mismatch in sequence numbers, we thought of resetting the same at our end to match the expected sequence numbers at the partner's end.
We are certain that we can find the expected channel sequence numbers for our sender channel in the logs, but not sure if the same information can be captured for our receiver channel as well.
This information would be very important to determin the expected sequence numbers.
So, this raises two questions for me.
1) Would I be able to view the expected sequence number for my receiver channel as well in the logs??
2) Would I be able to reset the sequence number of my receiver channel with this value??
Thanks for your help in this regard.
Cheers
Ajith |
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| wschutz |
| Posted: Thu Apr 27, 2006 2:45 am Post subject: |
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Jedi Knight
Joined: 02 Jun 2005
Posts: 3316
Location: IBM (retired)
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| vennela |
| Posted: Fri Apr 28, 2006 6:07 am Post subject: |
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Jedi Knight
Joined: 11 Aug 2002
Posts: 4055
Location: Hyderabad, India
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| Quote: |
| Is vice-versa true as well?? |
NO
| Quote: |
| This is because, we are doing MQ Server migration next week and we do not want to disturb our suppliers MQ configuration. |
I don't know what kind of migration you are doing, but if you are doing it right, you should not run into this kind of problem |
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| tleichen |
| Posted: Mon May 01, 2006 12:49 pm Post subject: |
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Yatiri
Joined: 11 Apr 2005
Posts: 663
Location: Center of the USA
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When channels are connected and communicating, the sequence number is maintained by the MCA. However, if channel communication is interrupted, and the number gets out of sequence, it may be necessary to reset both sender and receiver in order to get the channel to reconnect. I have seen this happen at various sites.
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IBM Certified MQSeries Specialist
IBM Certified MQSeries Developer |
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| vennela |
| Posted: Mon May 01, 2006 1:09 pm Post subject: |
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Jedi Knight
Joined: 11 Aug 2002
Posts: 4055
Location: Hyderabad, India
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| tleichen wrote: |
| When channels are connected and communicating, the sequence number is maintained by the MCA. However, if channel communication is interrupted, and the number gets out of sequence, it may be necessary to reset both sender and receiver in order to get the channel to reconnect. I have seen this happen at various sites. |
I do agree that channels going out of sequence can happen. But migration shouldn't induce the channel sequence problem. |
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| gdrucker |
| Posted: Wed Aug 16, 2006 9:58 am Post subject: Channel Resets |
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Apprentice
Joined: 17 Jun 2005
Posts: 36
Location: New York
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Hi all,
I am posting to this thread because it seems very similar to the concern that I have. We have configured a new MQ server to replace the old. When I shut down the old and bring up the new server, I have channel sequence number concerns. I understand that when I reset the channel number back to 1 on my sender channel, the receiver channel at the customer site will be synced. Not a problem.
What about the receiver channel? On my new server, won't those channel sequence numbers be set to 1, and when a customer starts his channel, (or when data is sent) won't the two be out of sync? By reseting my receiver back to 1, will that solve my problem. I don't have access to the sender channel at the customer site.
Any suggestions? Do I need to determine the last seq number sent on the sender, and reset my receiver to match?
Thank you. |
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| fjb_saper |
| Posted: Wed Aug 16, 2006 2:52 pm Post subject: |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY
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You can shut down the old receiver channels and check on the saved status the current seqnum.
Write it down. Don't remember if you have to set the new channel's seqnum to that one or one above. That should make able to read again new stuff.
Enjoy 
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| gdrucker |
| Posted: Fri Aug 18, 2006 7:51 am Post subject: |
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Apprentice
Joined: 17 Jun 2005
Posts: 36
Location: New York
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| Thanks for the tip. Sounds easy enough! Btw, we are migrating to an MQ running on Microsoft clustering solution which in my test environment seems to work extremely well. Thanks again. |
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