Cloning a db2 subsystem



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Cloning a db2 subsystem

Postby arshadhrashid » Fri Sep 21, 2012 10:28 pm

Hello there,
Just want some advise on this topic.
There are a lot of products avaiable which clone an entire db2 sub-system form lets say prod to test.
Is it something that can be done by one's own-self? I mean can I start looking for/developing procedures to do it myself or is is it something so complex or not doable that I have to buy a tool for it?

Any suggestion or pointing towards something of this nature would be highly appreciated.
Thanks a lot.
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Re: Cloning a db2 subsystem

 

Re: Cloning a db2 subsystem

Postby Peter_Mann » Fri Sep 21, 2012 11:35 pm

Define clone, if you currently have a instance of DB2 licensed and running, then the DB2 tools themself can clone (imagecopy) from one subsysetm to another, or some DASD subsystem tools can be used, or.......
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Re: Cloning a db2 subsystem

Postby arshadhrashid » Fri Sep 21, 2012 11:48 pm

Thanks for your reply Peter.
By clone I mean an exact copy.
I have a sub system called A and I want to make a comlpete copy of it as another subsystem B on the same LPAR.
The B will not share anything with A.

I can copy all the datasets that comprise a sub system to a new VACT but a clone takes more than that.
Some internals of db2 needs to be updated at the B system

IBM DB2 Tools is a seperate product and it doesnot come with a db2 license.
I was thinking to write JCLs and SQLs scripts to perform that.

thanks
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Re: Cloning a db2 subsystem

Postby Peter_Mann » Sat Sep 22, 2012 12:30 am

Well, I'll see if a DB2 expert can chime in here, but the only way I know to clone the DB2 tables is with a tool designed to do so, IBM's Inforsphere CDC tools is one, I would think a DB2 image copy would suffice, but like I said, I'm not a DB2 guy. I've seen folks unload a db2 table in it's raw form and reload to a new subsystem, we're currenty using an EMC DASD tool today to clone a DB2 subsysetm from PROD, for test refresh this is done every quater, I'm not sure what the DBA's do after the refresh is complete, but I know the process is not so difficult.
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Re: Cloning a db2 subsystem

Postby arshadhrashid » Fri Sep 28, 2012 9:07 pm

Peter
Since no reply received, as your requested, I think your shop has the solution.
As you mentioned after copying data using EMC DASD tool to clone then DBAs do something after wards , is the solution. I can make physical copies of data by any mean but what has to be done afterwards is the answer. If your DBAs can shed some light on what do they do afterwars , I would really appreciate.

Thanks
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Re: Cloning a db2 subsystem

Postby Peter_Mann » Fri Sep 28, 2012 9:14 pm

We're in the process of this right now, the DASD tool (EMC) today clones the volumes, the DBA's run DB2 utilities to change internal DB2 catalog info, I'll have to see if I can get some detail for you on what is done after the volumes are cloned.
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Re: Cloning a db2 subsystem

Postby Peter_Mann » Fri Sep 28, 2012 10:53 pm

Looking at the ENTIRE documention to CLONE DB2 from one subsystem to another is quite lengthy and detailed, some of the information is specifc to the DASD enviorment we have today and our setup internal to the DASD subsystem, I will try yo provide some HL steps, but you need to create a plan for your enviorment based on your hardware and document this process as the folks here have to do this without missing a beat, as I stated above I will provide a HL task list when I get some time
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Re: Cloning a db2 subsystem

Postby Peter_Mann » Fri Sep 28, 2012 11:16 pm

Here's a HL of the process we perform
DIsclamer: these steps and the process within are specific to our envirnement
THIS IS THE INFO TO CLONE DBXX FROM DBXX.                               
                                                                       
NOTE1  - THIS PROCESS WILL TAKE ALL THE DB2CATRP DATASETS AND THE       
         VOLUME XXXXXX AND XXXXXX                                       
         THIS CAN BE DONE WHILE DBXX IS UP OR DOWN.                     
         IF UP, DBXXL1 IS BEING COPIED, SO YOU WILL NEED TO DO         
         AN ARCHIVE LOG COMMAND UNTIL  DS01 OR 03 OR 05 IS             
         THE CURRENT ACTIVE LOG FOR DBXX.                               
                                                                       
         JOBS THAT EXECUTE MS/VCR PROGRAMS WILL                         
         NEED TO RUN ON AN LPAR ON THE XXX.                             
                                                                       
         JOB1 WILL VARY DEVICES ONLINE TO THE LPAR WHERE IT           
         RUNS AND THE DASD TASK 2 JOBS SHOULD RUN ON THIS SAME LPAR.   
                                                                       
         THE TARGET VOLUMES SHOULD ONLY BE VARIED ONLINE TO THIS       
         SAME LPAR TO PREVENT CONTENTION FROM OTHER LPARS.             
                                                                       
         BEFORE STARTING THIS PROCESS, THE TARGET VOLUMES AND CATALOG   
         SHOULD BE EMPTY.  GET WITH SYSTEMS IF NEEDED ON THE CATALOG.   
                                                                       
         IF THIS IS THE FIRST TIME THE TARGET IS BEING CLONED, YOU MUST
         BIND THE MS/VCR PLAN ON THE TARGET SO IT WILL BE ON THE CLONE.
                                                                       
*DURING THE BELOW TIME, THE SOURCE DB2(DBXX) IS SUSPENDED. THESE STEPS 
 SHOULD BE DONE AS QUICKLY AS POSSIBLE. SUSPEND/RESUME IS ONLY NEEDED   
 IF YOU ARE CLONING AN ACTIVE SYSTEM.                                   
                                                                       
JOB1A - *ISSUE DB2 COMMAND TO SUSPEND DB2 ACTIVITY ON DBXX             
           - *SPLIT THE BCVS                                               
JOB2 - *VCR JOB TO CREATE THE JOURNAL USED IN SUBSEQUENT STEPS.  THIS
          ALSO RESULTS IN THE BCVS BEING VARIED ONLINE AND CLIPPED TO   
          THE NAME SPECIFIED IN THE PARM FILE, CURRENTLY SCR001-SCR091 
                                                                       
NOTE2  - IF THE ABOVE JOBS DO NOT FINISH CORRECTLY, YOU SHOULD RESUME   
         DB2 AS QUICKLY AS POSSIBLE AND PLAN A DO OVER.  THIS APPLIES   
         ONLY IF YOU ARE CLONING THE SYSTEM WHEN IT IS UP               
                                                                       
JOB3 - *RESUME THE SOURCE DB2                                         
                                                                       
*DURING THE ABOVE TIME, THE SOURCE DB2 IS SUSPENDED. THESE STEPS SHOULD
 BE DONE AS QUICKLY AS POSSIBLE.                                       
                                                                       
    - START FULL VOLUME MOVES FROM THE SPLIT BCV TO THE TARGET VOLS 
                                                                       
JOB4 - BACKUP OF THE JOURNAL FILE FOR POSSIBLE REDO                   
JOB5 - CREATE BACKUP FOR UCATBKUP.BKP AND IEBGENER TO THE BACKUP     
      - ONCE SOURCE VOLS(BCVS) ARE COPIED TO TARGET VOLS               
         VARY THE BCV DEVICES OFFLINE TO PREVENT PROBLEMS SINCE         
         THESE VOLUMES CONTAIN IDENTICAL DATA AS THE TARGETS           
                                                                       
MUST WAIT FOR DASD jobs above TO FINISH BEFORE CONTINUING                       
                                                                       
JOB6 - VCR STEP ISSUES VOLOPTIONS TO CHANGE THE VOLSERS IN VCR FILES 
         SINCE WE COPIED THE DATA FROM THE BCVS TO TARGET VOLUMES       
JOB7 - VCR STEP DOES THE "CLONING" BY RENAMING AND CATALOGING THE     
         DATASETS THAT WERE COPIED FROM THE BCVS TO THE TARGET VOLS     
JOB8 - CREATE AND FORMAT TARGET ACTIVE LOG FILES.  THIS MAY RUN LONG 
         DEPENDING ON THE SIZE AND NUMBER OF ACTIVE LOGS.  YOU CAN     
         CONTINUE TO JOB013 WHILE THIS JOB RUNS.                       
JOB9 - CREATE NEW BSDS02 FILE AND COPY DATA FROM PRIMARY BSDS01       
JOB10 - VCR STEP UPDATES BSDS/DBD01 WITH TARGET INFORMATION           
JOB11 - CREATE TARGET DSNDB07 WORK FILES                               
JOB12 - DELETE/RECATALOG DSNLOAD/DSNEXIT/RUNLIB.LOAD AND ENSURE THEY   
         ARE ON THE CORRECT APF VOLUME.                                 
JOB13 - ASSEMBLE ZPARM WITH VCR SYSLIB.  THIS ALLOWS UPDATES TO THE   
         CATALOGS.  YOU WILL ALSO WANT TO CHANGE THE SYSADM USERID     
         TO YOUR USERID.                                               
JOB14 - REMOVE ACTIVE LOGS FROM THE TARGET BSDS SINCE THOSE VOLUMES   
         WERE NOT BCV'D                                                 
JOB15 - ADD 1 ACTIVE LOG INTO THE TARGET BSDS                         
JOB16 - ADD REMAINDER OF ACTIVE LOG INTO THE TARGET BSDS               
JOB17 - REMINDER THAT JOB008 MUST COMPLETE BEFORE CONTINUING           
    - VARY DFD VOLUMES ONLINE TO ALL SYSTEMS                         
JOB18 - START DB2 ACCESS(MAINT).  UNCATALOGED DB01/06 MESSAGES ARE     
         NORMAL ON THIS FIRST EXECUTION OF TARGET DB2.                 
JOB19 - VCR STEP THAT COMPLETES THE RENAME/CATALOGING OF ALL DB01/06   
JOB20 - VCR STEP UPDATES CATALOG/DIRECTORY INFO                       
JOB21 - BRING DOWN TARGET DB2                                         
JOB22 - ASSEMBLE ZPARM WITHOUT VCR SYSLIB.                             
JOB23 - NORMAL START TARGET DB2                                       
JOB24 - VCR STEP CHECKS AND FIXES DB01/06 SPACES FOR LPL ECT           
JOB25 - VCR STEP CHACKS AND FIXES ALL OTHER SPACES FOR LPL ECT         
JOB26 - BRING DOWN TARGET DB2                                         
JOB27 - ASSEMBLE ZPARM WITH CORRECT SYSADM ID IF YOU CHANGED THEM     
JOB28 - NORMAL START DB2                                             
JOB29 - RUN THROUGH THE LOGS TO BE SURE THEY ARE COOL                 
JOB30 - DB2 MUST BE DOWN---REMOVE LOGS FROM NON SMS MANAGED VOLUMES   
         MAKE SURE ACTIVE LOG IS NOT THE ONE YOU ARE REMOVING.         
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Re: Cloning a db2 subsystem

Postby arshadhrashid » Sat Sep 29, 2012 12:12 am

Peter,
Thank you very much for this detailed reply.
I will go over it and try to mimic it in my environment.

Once again thanks a lot.
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