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auto reset channel sequence number

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simyobs

Posted: Thu Sep 18, 2008 11:10 pm Post subject: auto reset channel sequence number

Newbie

Joined: 15 Sep 2008
Posts: 5

Hi,

Is there's a possible way to auto reset the channel sequence number.

Letâ€™s say we have:

1. AppQmgr
2. QMA (active)
3. QMB(passive)

Active/Passive are supported on HACMP environment

AppQmgr communicates with QMA.

If QMA fails then QMB qmgrs is activated. Hence, the sequence number would become different when AppQmgr connects to QMB.

How do handle such scenarios. Auto resetting on sequence numbers can really help

simyobs

Michael Dag

Posted: Thu Sep 18, 2008 11:34 pm Post subject:

Jedi Knight

Joined: 13 Jun 2002
Posts: 2607
Location: The Netherlands (Amsterdam)

auto resetting channel sequences

can cause serious loss of messages!

if you have HACMP I assume you are on AIX, the passive backup on the 'other' machine Qmgr is QMA too (read up on it in the documentation)

using failover you failover the filesystem and bring up QMA on the other machine...
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simyobs

Posted: Fri Sep 19, 2008 12:47 am Post subject:

Newbie

Joined: 15 Sep 2008
Posts: 5

my mistake.

The scenario should

1. AppQmgr
2. QMA (active) SystemA
3. QMA(passive) SystemB
Active/Passive on AIX HACMP environment

AppQmgr connected to QMA(acitve) SystemA.

In-case of failover, QMA(passive) is activated on SystemB, then AppQmgr will encounter channel sequence problem.

How to manage this scenario with-out manual intervention.

simyobs

PeterPotkay

Posted: Fri Sep 19, 2008 4:40 am Post subject:

Poobah

Joined: 15 May 2001
Posts: 7722

simyobs wrote:

How to manage this scenario with-out manual intervention.

Set up your H.A. cluster properly and there won't be a channel sequence problem.

Read this:
http://www.ibm.com/developerworks/websphere/library/techarticles/0505_hiscock/0505_hiscock.html

Read it again, then read this:
http://www-01.ibm.com/support/docview.wss?rs=171&uid=swg24011869
_________________
Peter Potkay
Keep Calm and MQ On

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