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MQSeries.net Forum IndexMainframe, CICS, TXSeriesDefine 1 or 2 Linklist & LLA or for 2 QMGRs on 1 LPAR zO

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InTheLoop
PostPosted: Sat Mar 09, 2019 10:17 pm Post subject: Define 1 or 2 Linklist & LLA or for 2 QMGRs on 1 LPAR zO Reply with quote

Newbie

Joined: 24 Jan 2017
Posts: 7

Hi All ,

Can anyone please advise me on this?i have been trying to get a proper answer but still not .

I am having 2 QMGR's Running on the same LPAR using 2 different sets of MQ datasets (HLQ)
Both QMGRS have been working with no issues with only a single set of MQ datasets defined in the linklist and LLA on the same LPAR
Datasets for both QMGRS have different names ,
My Question is it advisable or risky to define 2 linklist and LLA, one for each QMGR on the same LPAR ?

Thanks in advance
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bruce2359
PostPosted: Sun Mar 10, 2019 5:24 am Post subject: Re: Define 1 or 2 Linklist & LLA or for 2 QMGRs on 1 LPA Reply with quote

Poobah

Joined: 05 Jan 2008
Posts: 8459
Location: US: west coast, almost. Otherwise, enroute.

InTheLoop wrote:
My Question is it advisable or risky to define 2 linklist and LLA, one for each QMGR on the same LPAR ?


You say everything is running fine, so why change anything?

LPA defines which libraries executables are to be part of the z/OS virtual image common area, and available to all address spaces.

MQ for z/OS "early code" needs to be in LPA. To run multiple MQ VRM's, the "early code" of the highest VRM needs to be in LPA.

Briefly, LINKLIST defines which libraries will be searched (and in which order) for executables if not found in JOBPACK, JOBLIB, STEPLIB searches. I would not recommend LINKLISTing MQ libraries. LLA is used to speed up searches (I/O involved) for frequently used objects, and will benefit MQ run-time.

For run-time and for maintenance purposes, the VRM-specific "other code" libraries are usually STEPLIB'd in the startup JCL for each qmgr.

See https://www.ibm.com/support/knowledgecenter/en/SSFKSJ_9.0.0/com.ibm.mq.con.doc/q019120_.htm

In a single LPAR, there is only one z/OS image, one common area, one LPA, one LINKLIST, one LLA, one instance of early code. So, your question/concern about having separate instances of these for each qmgr makes little sense.

Did I misunderstand your question?
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Last edited by bruce2359 on Mon Mar 11, 2019 7:47 am; edited 6 times in total
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bruce2359
PostPosted: Sun Mar 10, 2019 6:36 am Post subject: Reply with quote

Poobah

Joined: 05 Jan 2008
Posts: 8459
Location: US: west coast, almost. Otherwise, enroute.

Moved to mainframe forum
_________________
There are two types of people in this world:
1) Those that can extrapolate from incomplete data
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InTheLoop
PostPosted: Mon Mar 11, 2019 11:44 pm Post subject: Reply with quote

Newbie

Joined: 24 Jan 2017
Posts: 7

Thanks for your reply ,

You did not misunderstood my Question and actually provided a very valid point and a good explanation, why making a change while everything is running smooth , I will keep the system as it was designed , there is no valid reason for me to make any changes at this point .
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MQSeries.net Forum IndexMainframe, CICS, TXSeriesDefine 1 or 2 Linklist & LLA or for 2 QMGRs on 1 LPAR zO
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