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VSAM I/O - Extended Addressability - code changes Read more


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amitsjcntl

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Joined: 30 Jun 2020
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PostPosted: Mon Jul 06, 2020 3:51 pm
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As suggested, starting anew topic.

Hello

Once we have defined the extended VSAMs, what other places are affected? I mean, do I need to change the code also (Assembler), somewhere, in order to enable its use?

I researched it a bit and could not find any specific manual which lists this out in detail. Does anyone has any reference?

Also, I could see that the we need to use XRBA instead of RBA in the macros like GET, POINT and so on.

Just looking for a proper guidance (manual) to enable extended addressability for VSAM.

Any suggestions would be helpful.

Thanks


Thank you for your reply Robert Sample (in the other topic chain).

Do we have any specific manual for Extended Addressabilty for VSAM, which details out all that changes?
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Apoorva

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PostPosted: Mon Jul 06, 2020 4:50 pm
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amitsjcntl wrote:
As suggested, starting anew topic.

Hello

Once we have defined the extended VSAMs, what other places are affected? I mean, do I need to change the code also (Assembler), somewhere, in order to enable its use?

I researched it a bit and could not find any specific manual which lists this out in detail. Does anyone has any reference?

Also, I could see that the we need to use XRBA instead of RBA in the macros like GET, POINT and so on.

Just looking for a proper guidance (manual) to enable extended addressability for VSAM.

Any suggestions would be helpful.

Thanks


Thank you for your reply Robert Sample (in the other topic chain).

Do we have any specific manual for Extended Addressabilty for VSAM, which details out all that changes?


1. Is it a KSDS VSAM dataset?
2. Are you converting an existing VSAM dataset to extended one? If so then what OPTCD have you been using currently?

RBA/XRBA comes into picture only when you are using OPTCD=ADR option in your RPL.
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Rohit Umarjikar

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PostPosted: Mon Jul 06, 2020 7:51 pm
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Ref to the old post- ibmmainframes.com/viewtopic.php?t=39485
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amitsjcntl

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PostPosted: Wed Jul 08, 2020 7:44 pm
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Hello Apoorva

I am enabling the full VSAM system (both batch and online) to be able to work with extended datasets.
What I understand so far is that we need to use XRBA instead of RBA enable this and maybe KSDS will work without making any changes to the I/O code.

I am looking for other stuff which may require changes or a document which explains extended addressability for VSAM in detail.
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amitsjcntl

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PostPosted: Wed Jul 08, 2020 7:45 pm
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Thanks for the link Rohit !
But that does not have information which I am looking for.
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Rohit Umarjikar

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PostPosted: Wed Jul 08, 2020 7:57 pm
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amitsjcntl wrote:
Thanks for the link Rohit !
But that does not have information which I am looking for.

I haven't said it has what you looking for. It is just to understand the link between this new post and attach is to old post to which you responded.

Second, Did you look up in the Manuals ? Following should help you to be the starting points.
Upgrading a standard ESDS to an extended addressing ESDS
2.4 Extended Addressability
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Apoorva

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PostPosted: Wed Jul 08, 2020 8:44 pm
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amitsjcntl wrote:
Hello Apoorva

I am enabling the full VSAM system (both batch and online) to be able to work with extended datasets.
What I understand so far is that we need to use XRBA instead of RBA enable this and maybe KSDS will work without making any changes to the I/O code.

I am looking for other stuff which may require changes or a document which explains extended addressability for VSAM in detail.


Hello Amit,

Right you need not worry about KSDS VSAM files that are just using OPTCD=KEY. You just need to look for VSAM files (could be KSDS or ESDS) that are using OPTCD=ADR in which case you may have to change RBA to XRBA. (i.e 4 bytes RBA to 8 bytes RBA).
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amitsjcntl

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PostPosted: Thu Jul 09, 2020 6:58 pm
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Thanks Apporva !
Is this the only thing that changes with the extended VSAM?
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Pete Wilson

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Joined: 31 Dec 2009
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PostPosted: Mon Jul 20, 2020 9:54 pm
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yes, they can be larger than 4GB in size. Too be Extended Addressibility they have to also be Extended Format which enables other functionality such as Data Set Encryption, Compression, Striping, and more.

See this for more details:
www-03.ibm.com/support/techdocs/atsmastr.nsf/WebIndex/PRS5399
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amitsjcntl

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PostPosted: Thu Jul 23, 2020 4:09 pm
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Thank you for your response Pete.
I am unable to open this link. Is it still active?
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Pete Wilson

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PostPosted: Thu Jul 23, 2020 4:48 pm
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That link no longer works for me either, sorry about that.

Perhaps just look through the relevant parts of the 'Using Data Sets' manual as that covers Extended Format and Extended Addressability comprehensively.

www-01.ibm.com/servers/resourcelink/svc00100.nsf/pages/zOSV2R3sc236855/$file/idad400_v2r3.pdf
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enrico-sorichetti

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PostPosted: Fri Jul 24, 2020 12:17 am
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it works for me ...

it arrives to
z/OS Extended Format Datasets - Background, Benefits, and Implementation

Quote:
Abstract: This document organizes 4 other Techdocs which are part of a larger project focusing on Extended Format Datasets in z/OS. The linked documents, taken together, provide an overview of Extended Format Data Sets, describe the benefits of migrating to Extended Format (particularly Data Set Encryption), and provide a tutorial for allocating datasets in Extended Format within ISMF.
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amitsjcntl

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PostPosted: Fri Jul 24, 2020 8:31 pm
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Thanks Pete and Enrico.
I just searched "z/OS Extended Format Datasets - Background, Benefits, and Implementation" in Google and was able to open the page.
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