Thompson, Steve wrote:
-----Original Message-----
From: IBM Mainframe Discussion List [mailto:ibm-m...@bama.ua.edu] On
Behalf Of Ron Hawkins
Sent: Thursday, March 04, 2010 1:06 PM
To: IBM-MAIN@bama.ua.edu
Subject: Re: Defrag
Steve,
That's not exactly correct. It's 16 extents for 59 volumes and then
you're
done. John's answer is the solution for your problem. ACC and STOP-X37
users
have known this for 30 years.
From "Using Data Sets":
Many types of data sets are limited to 65535 total tracks allocated
on any one volume, and if a greater number of tracks is required,
this attempt to create a data set will fail.
Data sets that are not limited to 65535 total tracks allocated on
any one volume are:
* Large format sequential
* Extended-format sequential
* UNIX files
* PDSE
* VSAM
Maximum Number of Volumes
PDS and PDSE data sets are limited to one volume.
All other DASD data sets are limited to 59 volumes. A data set
on a VIO simulated device is limited to 65 535 tracks and is
limited to one volume. Tape data sets are limited to 255 volumes.
A multivolume direct (BDAM) data set is limited to 255 extents
across all volumes. The system does not enforce this limit when
creating the data set but does enforce it when you open the data
set by using the BDAM.
Maximum VSAM Data Set Size
A VSAM data set is limited to 4 GB across all volumes unless
Extended Addressability is specified in the SMS data class
definition. System requirements restrict the number of volumes
that can be used for one data set to 59. Using extended addressability,
the size limit for a VSAM data set is determined by either:
* Control interval size multiplied by 4 GB
* The volume size multiplied by 59.
Primary and Secondary Space Allocation without the
Guaranteed Space Attribute
.
.
.
* A sequential data set can have 16 extents on each volume.
* An extended-format sequential data set can have 123 extents per volume.
* A PDS can have 16 extents.
* A direct data set can have 16 extents on each volume.
* A non-system-managed VSAM data set can have up to 255 extents per
component. System-managed VSAM data sets can have this limit removed
if the associated data class has extent constraint removal specified.
* A system-managed VSAM data set can have up to 255 extents per stripe.
This limit can be removed if the associated data class has extent
constraint removal specified.
* A PDSE can have 123 extents.
* An HFS data set can have 123 extents on each volume.
--
Kind regards,
-Steve Comstock
The Trainer's Friend, Inc.
303-393-8716
http://www.trainersfriend.com
* z/OS application programmer training
+ Instructor-led on-site classroom based classes
+ Course materials licensing
+ Remote contact training
+ Roadshows
+ Course development
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