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 | | From: | Michael Rosinger | | Subject: | calling all VSAM experts... | | Date: | Fri, 21 Jan 2005 06:19:02 -0500 |
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 | List,
Someone is telling me that it is possible to have up to 128 extents for
a VSAM dataset on a single volume. Everything that I've always read and
heard is that the maximum is 16 extents per volume. Is this true? If it
is, is it true for VSAM-managed SAM datasets as well or just true VSAM?
If there is any basis for this claim, could you point me to the proper
place in one of the VSAM books? TIA
--
Michael Rosinger
Systems Programmer/DBA
Computer Credit, Inc.
640 W. 4th Street
Winston-Salem, NC 27101
voice : 336-761-1524
fax : 336-761-8852
email : mrosinger at cciws dot com
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| | From: | Yiannakis Vakis | | Subject: | RE: calling all VSAM experts... | | Date: | 21 Jan 2005 03:46:48 -0800 |
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| There's a basis for this if you define your dataset with NOREUSE.
Yiannakis
-----Original Message-----
From: owner-vse-l@Lehigh.EDU [mailto:owner-vse-l@Lehigh.EDU]On Behalf Of
Michael Rosinger
Sent: Friday, January 21, 2005 1:19 PM
To: VSE Discussion List
Subject: calling all VSAM experts...
List,
Someone is telling me that it is possible to have up to 128 extents for
a VSAM dataset on a single volume. Everything that I've always read and
heard is that the maximum is 16 extents per volume. Is this true? If it
is, is it true for VSAM-managed SAM datasets as well or just true VSAM?
If there is any basis for this claim, could you point me to the proper
place in one of the VSAM books? TIA
--
Michael Rosinger
Systems Programmer/DBA
Computer Credit, Inc.
640 W. 4th Street
Winston-Salem, NC 27101
voice : 336-761-1524
fax : 336-761-8852
email : mrosinger at cciws dot com
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| | From: | Panayiotis Petrou | | Subject: | RE: calling all VSAM experts... | | Date: | 21 Jan 2005 03:50:37 -0800 |
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| An excerpt from the VSAM commands manual (SC33-6831)
CYLINDERS(primary)
........................ If secondary is specified, space for a component can
be
expanded to include a maximum of 123 extents or 16 extents per volume for a
reusable (dynamic) file. For a component with the UNIQUE attribute, 16
extents
are allowed per volume. The total size of a VSE/VSAM data set cannot exceed
4GB (X'FFFFFFFF' bytes).
I am sure more details can be found in the VSE/VSAM User Guide (SC33-6732)
Regards
-----Original Message-----
From: owner-vse-l@Lehigh.EDU [mailto:owner-vse-l@Lehigh.EDU]On Behalf Of
Michael Rosinger
Sent: Friday, January 21, 2005 1:19 PM
To: VSE Discussion List
Subject: calling all VSAM experts...
List,
Someone is telling me that it is possible to have up to 128 extents for
a VSAM dataset on a single volume. Everything that I've always read and
heard is that the maximum is 16 extents per volume. Is this true? If it
is, is it true for VSAM-managed SAM datasets as well or just true VSAM?
If there is any basis for this claim, could you point me to the proper
place in one of the VSAM books? TIA
--
Michael Rosinger
Systems Programmer/DBA
Computer Credit, Inc.
640 W. 4th Street
Winston-Salem, NC 27101
voice : 336-761-1524
fax : 336-761-8852
email : mrosinger at cciws dot com
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| | From: | Kevin Corkery | | Subject: | RE: calling all VSAM experts... | | Date: | 21 Jan 2005 03:43:52 -0800 |
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| Seems the limitation has more to do with being implicitly defined as
reusable since reuseable clusters of any kind share the same limitation. A
non-resuable cluster can have up to the maximum of 123 extents not limited
by volume while reusable clusters are limited to 16 per volume.
http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/iesvge00/8.6.3.2?
ACTION=MATCHES&REQUEST=extents&TYPE=FUZZY&SHELF=IESVSE41&DT=19990426211356&C
ASE=&searchTopic=TOPIC&searchText=TEXT&searchIndex=INDEX&rank=RANK&ScrollTOP
=FIRSTHIT#FIRSTHIT
Kevin P Corkery
Independent Consultant
Voorhees, New Jersey
-----Original Message-----
From: owner-vse-l@Lehigh.EDU [mailto:owner-vse-l@Lehigh.EDU] On Behalf Of
Michael Rosinger
Sent: Friday, January 21, 2005 6:19 AM
To: VSE Discussion List
Subject: calling all VSAM experts...
List,
Someone is telling me that it is possible to have up to 128 extents for a
VSAM dataset on a single volume. Everything that I've always read and heard
is that the maximum is 16 extents per volume. Is this true? If it is, is it
true for VSAM-managed SAM datasets as well or just true VSAM?
If there is any basis for this claim, could you point me to the proper place
in one of the VSAM books? TIA
--
Michael Rosinger
Systems Programmer/DBA
Computer Credit, Inc.
640 W. 4th Street
Winston-Salem, NC 27101
voice : 336-761-1524
fax : 336-761-8852
email : mrosinger at cciws dot com
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