*WARNING* Long post
We've just gotten qround to using SMS for our development datasets and
I've been researching a problem that has stumped me.
All our SMS allocations use the same dataclass, DEFAULT.
When let SMS control the allocation we consistently get less space than we
requested (654 instead of 780 tracks) (STEP SMSDFLT)
If we use STORCLAS(NONSMS) which our ACS routines use to set
STORCLAS=null, we get the allocation we expect. (STEP NOSMS)
What is unusual is that if SMS does the allocation BUT we specify
UNIT=3390, we get the space we want. (STEP SMSWUNIT)
What else could be affecting the allocation?
Details below:
1 //AMDTEST JOB ...
2 //SMSDFLT EXEC PGM=IEFBR14
3 //NEW DD
DSN=IBMUSER.AMD.CA73.TEST2.DEFAULT,DISP=(NEW,CATLG),
// SPACE=(TRK,(780,0)),LRECL=80,BLKSIZE=6080
4 //NOSMS EXEC PGM=IEFBR14
5 //NEW DD DSN=IBMUSER.AMD.CA73.TEST2.NOSMS,DISP=(NEW,CATLG),
// SPACE=(TRK,(780,0)),LRECL=80,BLKSIZE=6080,STORCLAS=NONSMS,
// UNIT=3390,VOL=SER=MS3A40
6 //SMSWUNIT EXEC PGM=IEFBR14
7 //NEW DD DSN=IBMUSER.AMD.CA73.TEST2.WUNIT,DISP=(NEW,CATLG),
// SPACE=(TRK,(780,0)),LRECL=80,BLKSIZE=6080,
// UNIT=3390
DTM1459I 2013.148 13:09:57 JOB AMDTEST REQUEUED TO CLASS=E PRIORITY=9
ICH70001I IBMUSER LAST ACCESS AT 13:03:54 ON TUESDAY, MAY 28, 2013
IEF236I ALLOC. FOR AMDTEST SMSDFLT
IGD101I SMS ALLOCATED TO DDNAME (NEW )
DSN (IBMUSER.AMD.CA73.TEST2.DEFAULT )
STORCLAS (AMD) MGMTCLAS (DEFAULT) DATACLAS (DEFAULT)
VOL SER NOS= SUPP00
IEF142I AMDTEST SMSDFLT - STEP WAS EXECUTED - COND CODE 0000
IGD104I IBMUSER.AMD.CA73.TEST2.DEFAULT RETAINED, DDNAME=NEW
IEF373I STEP/SMSDFLT /START 2013148.1309
IEF032I STEP/SMSDFLT /STOP 2013148.1309
CPU: 0 HR 00 MIN 00.02 SEC SRB: 0 HR 00 MIN 00.00
SEC
VIRT: 4K SYS: 260K EXT: 0K SYS: 12440K
IEF236I ALLOC. FOR AMDTEST NOSMS
IGD100I 3A40 ALLOCATED TO DDNAME NEW DATACLAS ( )
IEF142I AMDTEST NOSMS - STEP WAS EXECUTED - COND CODE 0000
IEF285I IBMUSER.AMD.CA73.TEST2.NOSMS CATALOGED
IEF285I VOL SER NOS= MS3A40.
IEF373I STEP/NOSMS /START 2013148.1309
IEF032I STEP/NOSMS /STOP 2013148.1309
CPU: 0 HR 00 MIN 00.01 SEC SRB: 0 HR 00 MIN 00.00
SEC
VIRT: 4K SYS: 260K EXT: 0K SYS: 12432K
IEF236I ALLOC. FOR AMDTEST SMSWUNIT
IGD101I SMS ALLOCATED TO DDNAME (NEW )
DSN (IBMUSER.AMD.CA73.TEST2.WUNIT )
STORCLAS (AMD) MGMTCLAS (DEFAULT) DATACLAS (DEFAULT)
VOL SER NOS= SUPP01
IEF142I AMDTEST SMSWUNIT - STEP WAS EXECUTED - COND CODE 0000
IGD104I IBMUSER.AMD.CA73.TEST2.WUNIT RETAINED, DDNAME=NEW
DSLIST - Data Sets Matching IBMUSER.AMD Row 1
of 3
Command ===> Scroll ===>
PAGE
Command - Enter "/" to select action Tracks %Used
XT
-------------------------------------------------------------------------------
IBMUSER.AMD.CA73.TEST2.DEFAULT 654 0
1
IBMUSER.AMD.CA73.TEST2.NOSMS 780 ?
1
IBMUSER.AMD.CA73.TEST2.WUNIT 780 0
1
DATA CLASS ALTER Page 1 of 5
Command ===>
SCDS Name . . . : SYS9.SCDS.PLEX1
Data Class Name : DEFAULT
To ALTER Data Class, Specify:
Description ==> DEFAULT DATA CLASS
==>
Recfm . . . . . . . . . . (any valid RECFM combination or
blank)
Lrecl . . . . . . . . . . (1 to 32761 or blank)
Override Space . . . . . N (Y or N)
Space Avgrec . . . . . . (U, K, M or blank)
Avg Value . . . . . (0 to 65535 or blank)
Primary . . . . . . (0 to 999999 or blank)
Secondary . . . . . (0 to 999999 or blank)
Directory . . . . . (0 to 999999 or blank)
Retpd or Expdt . . . . . (0 to 93000, YYYY/MM/DD or blank)
Volume Count . . . . . . 1 (1 to 255 or blank)
Add'l Volume Amount . . . (P=Primary, S=Secondary or blank)
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