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MQSeries.net Forum Index » General IBM MQ Support » RCVR channel does not come down!

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muralihegde
PostPosted: Wed Oct 16, 2002 10:47 pm    Post subject: RCVR channel does not come down! Reply with quote

Centurion

Joined: 30 Apr 2002
Posts: 108

Hi All,

We have this problem related to receiver channel on a queue manager running on S/390. Version 5.2

NTQMGR.TO.HOSTQMGR is the sender channel defined on our NT queue manger.
NTQMGR.TO.HOSTQMGR is the corresponding receiver channel defined on our S/390 HOST queue manger.

1. When we bring down the sender channel on NT Queue manager or the NT Queue manager itself, then the
a). Corresponding RCVR channel on the S/390 HOST Qmgr goes to INACTIVE state.
b). If we start the sender channel from the NT queue manger, then the channel goes into RUN state (both RCVR and SDR)
without any problem.

2. If the NT Sender channel comes down unpredictably for Network reason (i.e if the tcp ip link between the NT system
and the S/390 HOST system goes down or if we unplug the network cable on the NT Queue manger).
a). We observe that the RCVR on the S/390 HoST does not go to INACTIVE state. But it is still in the RUN state.
b). Because of this, when we re-start the Sender at NT, queue manager, it goes to RETRY state as the RCVR on S/390 HOST is
RUN state and so can not accept this connection.
c). We have to stop the RCVR on S/390 HOST with force option to make the status as STOP.
d). Start the same RCVR to bring it to INACTIVE state now.
e). Only now start the sender channel on NT to make it RUN.

Also strangely, in step C). if we stop it using normal option, then step d) makes the reciver RUN ! and the problem persists.


We experienced the same thing when the sender channel was defined on HP-Ux Qmgr like the NT Queue Manager.

All the queue managers are Version 5.2.1 The one on S/390 is 5.2

Is this a known problem for receiver channel on S/390?
Any fix pack or CSD available for this?

Will Appreciate some suggestions/ help ...

Thanks for your time
-Murali
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pgorak
PostPosted: Wed Oct 16, 2002 11:38 pm    Post subject: Reply with quote

Disciple

Joined: 15 Jul 2002
Posts: 158
Location: Cracow, Poland

There is a feature called "Adopting an MCA" which solves this problem. In short, it allows MQSeries to cancel a receiver (in circumstances you've mentioned) and to start a new one in its place. Consult MQSeries documentation for details.

Piotr
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PeterPotkay
PostPosted: Sun Oct 20, 2002 11:15 am    Post subject: Reply with quote

Poobah

Joined: 15 May 2001
Posts: 7716

HeartBeat Interval also directly addresses your situation. It allows RCVR channels to go Inactive automatically when a network goes down, so that when the sender attempts to reconnect, all is good.

The AdoptMCA feature helps when the SNDR tries to reestablish communication before the heartbeat interval expires.

Use both for best results.

See this link:
http://www.mqseries.net/phpBB/viewtopic.php?t=5136&highlight=
It goes into great detail on these 2 features.
_________________
Peter Potkay
Keep Calm and MQ On
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Safe
PostPosted: Mon Nov 18, 2002 11:42 pm    Post subject: Reply with quote

Newbie

Joined: 14 Aug 2002
Posts: 4
Location: amsterdam, holland

Hi,

Be carefull with implementing ADOPTMCA on OS/390 MQ v 5.2 You need some PTF's to have it working properly, otherwise you may have problems with shutting down MQ series and leave a lot of unowned storage in your system. Check IBM D'base.

Gr,

Sander
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