Actually the rule below depends on the DATACLAS Construct for additional
volumes. The default is Primary, which means a new Primary on every volume,
but it can be set to secondary so that VSAM datasets behave the same way as
Non-VSAM, allocating the secondary extent value on every subsequent
In a message dated 8/18/2008 7:24:37 P.M. Central Daylight Time,
[EMAIL PROTECTED] writes:
Total max extents vary depending on whether SMS
stripping and/or extended addressability which would put the max at 4080
extents. If Extent Constraint relief is used, then the max is 7257.
Then
Discussion List IBM-MAIN@BAMA.UA.EDU
To
IBM-MAIN@BAMA.UA.EDU
cc
Subject
Re: DASD Space Allocation
I was surprised to read that on second and subsequent volumes,
allocation
is based on SECONDARY amounts.
Just to confuse everything, VSAM rules are just the opposite. For VSAM
datasets
I was surprised to read that on second and subsequent volumes, allocation
is based on SECONDARY amounts.
Just to confuse everything, VSAM rules are just the opposite. For VSAM
datasets, the Primary is used on each subsequent volume for the initial extent
(s) on that volume, and then Secondary
VSAM: Volume 1 (Primary, then Seconary), Volumes 2-n (Primary, then Secondary)
Watch me be wrong about this one (123 Extents Maximum), no limit per volume
Pre z/OS 1.7 it was 123 extents on the first volume; 255 in total.
In 1.7, the maximum extents were changed.
I do not recall what the new
charlesSCHWAB
TIS Mainframe Storage Management
Remedy Queue: tis-hs-mstg
(602) 977-5154
-Original Message-
From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On
Behalf Of L D Owen
Sent: Monday, August 18, 2008 4:33 PM
To: IBM-MAIN@BAMA.UA.EDU
Subject: Re: DASD Space
If Extent Constraint relief is used, then the max is 7257.
Only as of z/OS 1.7.
Prior to that the max was 255.
-
Too busy driving to stop for gas!
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Recap:
Situation came up on a client site where they received a very large file,
2.988 million records, and allocate the file size at (cyl,(2500,100)) with a
unit parameter of sysda,10; the file is received across 2 volumes in 20
extents totaling 4,331 cylinders. I am not concerned about the
-
From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf
Of Ron Hawkins
Sent: Friday, August 15, 2008 12:50 AM
To: IBM-MAIN@BAMA.UA.EDU
Subject: Re: DASD Space Allocation
William,
Assuming you do not have any software with Primary or Secondary extent
reduction, or secondary
-Original Message-
From: IBM Mainframe Discussion List On Behalf Of William F Besnier
I'm not explaining my concerns correctly. My concern is not
the number of extents used; it is the space allocated, the
JCL space parameter is asking for 2500,100 cylinders of space
for a total
On Fri, 15 Aug 2008 09:07:52 -0400, William F Besnier [EMAIL PROTECTED]
wrote:
I'm not explaining my concerns correctly. My concern is not the number of
extents used; it is the space allocated, the JCL space parameter is asking
for 2500,100 cylinders of space for a total 4000 cylinders. What
@BAMA.UA.EDU
Subject: Re: DASD Space Allocation
I'm not explaining my concerns correctly. My concern is not the number of
extents used; it is the space allocated, the JCL space parameter is asking
for 2500,100 cylinders of space for a total 4000 cylinders. What seems to
have happened is the first volume
@BAMA.UA.EDU
Subject: Re: DASD Space Allocation
William,
Assuming you do not have any software with Primary or Secondary extent
reduction, or secondary extent increase rules. I'm talking pure dataset
allocation without any allocation recovery.
So, if the Primary was allocated in four extents, that means you
Sent: Friday, August 15, 2008 9:25 AM
To: IBM-MAIN@BAMA.UA.EDU
Subject: Re: DASD Space Allocation
-Original Message-
From: IBM Mainframe Discussion List On Behalf Of William F Besnier
I'm not explaining my concerns correctly. My concern is not
the number of extents used
Farrell
Sent: Friday, August 15, 2008 07:32
To: IBM-MAIN@BAMA.UA.EDU
Subject: Re: DASD Space Allocation
On Fri, 15 Aug 2008 09:07:52 -0400, William F Besnier [EMAIL PROTECTED]
wrote:
I'm not explaining my concerns correctly. My concern is not the number of
extents used; it is the space allocated
I'm not explaining my concerns correctly. My concern is not the number of
extents used; it is the space allocated, the JCL space parameter is asking
for 2500,100 cylinders of space for a total 4000 cylinders.
What seems to have happened is the first volume was allocated the primary + 3
extents
, August 14, 2008 7:17 PM
To: IBM-MAIN@BAMA.UA.EDU
Subject: Re: DASD Space Allocation
-Original Message-
From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On
Behalf Of Schwarz, Barry A
Sent: Thursday, August 14, 2008 6:44 PM
To: IBM-MAIN@BAMA.UA.EDU
Subject: Re: DASD Space
Subject: Re: DASD Space Allocation
I'm not explaining my concerns correctly. My concern is not the number
of extents used; it is the space allocated, the JCL space parameter is
asking for 2500,100 cylinders of space for a total 4000 cylinders. What
seems to have happened is the first volume was allocated
On Fri, 15 Aug 2008 11:47:38 -0700, Schwarz, Barry A
[EMAIL PROTECTED] wrote:
You specified (SYSDA,10) in your allocation. This means up to 4000
cylinders on the first volume and up to 1600 cylinders on each of up to
9 additional volumes.
...
Well, William shouldn't feel alone in this. I've
-Original Message-
From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On
Behalf Of Patrick O'Keefe
Sent: Friday, August 15, 2008 3:09 PM
To: IBM-MAIN@BAMA.UA.EDU
Subject: Re: DASD Space Allocation
SNIP
Well, William shouldn't feel alone in this. I've been mucking around
I was surprised to read that on second and subsequent volumes, allocation is
based on SECONDARY amounts.
Not only that, but if you do a DISP=MOD on an existing dataset, it uses the
SECONDARY.
The PRIMARY is not remembered anywhere; the SECONDARY is always.
I mean no disrespect, but I've known
List IBM-MAIN@BAMA.UA.EDU
To
IBM-MAIN@BAMA.UA.EDU
cc
Subject
Re: DASD Space Allocation
I'm not sure I understand what you mean; if the default volume is a 3380
and
the allocation is satisfied on a 3390, a larger volume, how would the
space
allocation be increased for the larger 3390
Situation came up on a client site where they received a very large file,
2.988 million records, and allocate the file size at (cyl,(2500,100)) with a
unit parameter of sysda,10; the file is received across 2 volumes in 20
extents totaling 4,331 cylinders. I am not concerned about the extents,
On Thu, 14 Aug 2008 17:22:35 -0400, William F Besnier wrote:
Situation came up on a client site where they received a very large file,
2.988 million records, and allocate the file size at (cyl,(2500,100)) with a
unit parameter of sysda,10; the file is received across 2 volumes in 20
extents
provided all 2500 cylinders in one extent, the
remaining 1831 cylinders does require 19 extents so it at least that
looks consistent.
-Original Message-
From: William F Besnier [mailto:[EMAIL PROTECTED]
Sent: Thursday, August 14, 2008 2:23 PM
To: IBM-MAIN@BAMA.UA.EDU
Subject: DASD Space
Of Tom Marchant
Sent: Thursday, August 14, 2008 6:05 PM
To: IBM-MAIN@BAMA.UA.EDU
Subject: Re: DASD Space Allocation
On Thu, 14 Aug 2008 17:22:35 -0400, William F Besnier wrote:
Situation came up on a client site where they received a very large file,
2.988 million records, and allocate the file
-Original Message-
From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf
Of Schwarz, Barry A
Sent: Thursday, August 14, 2008 6:44 PM
To: IBM-MAIN@BAMA.UA.EDU
Subject: Re: DASD Space Allocation
What is the LRECL, RECFM, and BLKSIZE? 4331 cylinders is 64,965 tracks
Please explain how 1831 cylinders requires 19 extents and that is consistent.
Maybe there is fragmentation on the secondaries?
When your allocation goes to secondary volumes, only the secondary extent is
used.
The primary is NOT remembered.
The primary could be broken up depending on the
William,
Assuming you do not have any software with Primary or Secondary extent
reduction, or secondary extent increase rules. I'm talking pure dataset
allocation without any allocation recovery.
So, if the Primary was allocated in four extents, that means you can have an
additional 12 extents
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