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| issac |
 Posted: Tue Apr 08, 2014 9:59 pm Post subject: Is it good practice to use AdoptNewMCA=ALL everywhere? |
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Disciple
Joined: 02 Oct 2008
Posts: 158
Location: Shanghai
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Hello, experts
Developers in my company are asking me to add AdoptNewMCA=ALL to every existing QMGR and all future QMGRs. I think there could be a reason for not being default. Then I looked up the InfoCenter and technotes, and surprisingly they're all talking about usage and benefits of the param, none talked about any shortage.
So is it good practice to use AdoptNewMCA=ALL everywhere? Isn't there any risk/shortcoming/warning to use the param?
Thanks in advance.
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| smdavies99 |
| Posted: Tue Apr 08, 2014 10:39 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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Ask yourself why the developers are asking for this change.
Are they expereincing some problem that needs this?
It might be nice to share those reasons here.
Adopting this change without a good reason (developer lazyness is not a good one) should be rejected.
How do you know that making this change won't break existing applications?
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Linux user since 1995
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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| zpat |
| Posted: Tue Apr 08, 2014 11:42 pm Post subject: |
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Jedi Council
Joined: 19 May 2001
Posts: 5866
Location: UK
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IBM generally don't change defaults when they add new features.
However this option makes a lot of sense and I have used for all my new QMs.
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Well, I don't think there is any question about it. It can only be attributable to human error. This sort of thing has cropped up before, and it has always been due to human error. |
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| issac |
| Posted: Wed Apr 09, 2014 12:38 am Post subject: |
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Disciple
Joined: 02 Oct 2008
Posts: 158
Location: Shanghai
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The reason is like this:
We had a chl pair: SDR on zos and RCVR on AIX, which from time to time breaks down. The RCVR side would have the false RUNNING status, and SDR would have trouble starting it.
Then they found this technote, which said they should use AdoptNewMCA=ALL
http://www-01.ibm.com/support/docview.wss?uid=swg21080140
I used this before, and am not objective to the idea if there's indeed uncertainties in network, like for geographically distant qmgrs. But I think they should investigate into the network and zOS to know why the SDR failed on zOS in the first place.
Later they got an IBM specilialist for zOS, who said the param is supposed to be set on zOS, and showed me another technote, whose title I forgot, and is basically about when you find channel in use error you should use AdoptNewMCA=ALL. I was like... okay, I know little about zos, and I don't mind to set according to an IBM expert...
However weeks after that, developers raised this question, why don't we set this for all qmgrs just to be sure there won't be similar issues even between aix machines? I'm getting somewhat puzzled... is the param really a musthave? if not why do'nt any doc give some side effect?
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| PeterPotkay |
| Posted: Wed Apr 09, 2014 3:11 am Post subject: |
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Poobah
Joined: 15 May 2001
Posts: 7722
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I set AdoptNewMCA to ALL on all my QMs, along with AdoptNewMCACheck to ALL as well, which helps insure only legitimate partners are asking for adoption.
Review the MD0C Support Pack "Keeping Channels Up and Running." Study this document. Review what it has to say about the Adopt* parameters.
I suppose the reason its not set by default to ALL is this warning in the InfoCenter:
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Attention!: The AdoptNewMCA attribute might behave in an unpredictable fashion with FASTPATH channels. Exercise great caution when enabling the AdoptNewMCA attribute for FASTPATH channels.
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http://pic.dhe.ibm.com/infocenter/wmqv7/v7r5/topic/com.ibm.mq.con.doc/q018980_.htm
But if you're not using FastPath channels, go for it, start using ALL.
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Peter Potkay
Keep Calm and MQ On |
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| JosephGramig |
| Posted: Wed Apr 09, 2014 5:01 am Post subject: |
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Grand Master
Joined: 09 Feb 2006
Posts: 1244
Location: Gold Coast of Florida, USA
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Peter,
The way I read that documentation the warning is only if you specify AdoptNewMCA=FASTPATH. If you choose ALL, it applies to all the channels except FASTPATH. At the top, it says this does not apply to z/OS.
So picking ALL does seem safe and the best option, imho. |
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| issac |
| Posted: Thu Apr 10, 2014 6:03 am Post subject: |
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Disciple
Joined: 02 Oct 2008
Posts: 158
Location: Shanghai
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That's ok. thanks everyone!
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