Changing SVC number for the Disk Open SVC.

Products

• Disk Backup and Restore - MVS
• DISK BACKUP AND RESTORE- ADD-ON OPTIO
• DISK BACKUP AND RESTORE

Issue/Introduction

How to change the SVC number of the Disk Open SVC?

Environment

Release: Disk-Backup and Restore 12.5

Resolution

Here are the steps for changing the SVC number of the Disk Open SVC from 252 to 230: 

1) Restore the Usermods of the 4 Open SVC Zaps via SMP/E. 

2) Update the 4 Open SVC Zaps to the new SVC number 

Note: The Open SVC Zaps are delivered for SVC number x'0AF4' (244) 

So need to change these Zaps to refer to SVC number x'0AE6' (230) 

3) Reapply the 4 Open SVC Zaps via SMP/E 

Refer these sample USERMOD members in the CCUWJCL lib - 

IFG0194E USERMOD2 
IFG0196W USERMODH 
IGGDAU01 USERMODI 
IFG0201R USERMODJ 

and consider to double-check via following DUMPT: 

//DUMPT EXEC PGM=AMASPZAP 
//SYSPRINT DD SYSOUT=* 
//SYSLIB DD DSN=SYS1.LPALIB,DISP=SHR 
//SYSIN DD * 
DUMPT IFG0194A IFG0194E 
DUMPT IGC0001I IFG0196W 
DUMPT IGGDADSM IGGDAU01 
DUMPT IGC00020 IFG0201R 
/*

4) Update the Disk entry in the active IEASVCnn member in SYS1.PARMLIB to point to SVC 230, for example: 
SVCPARM 230,REPLACE,TYPE(4),APF(NO),EPNAME(ADSMVS60) /*DISKOS*/ 

5) IPL 

6) Run a DMSTEST job to verify the hooks are in place. 

Once you have the 4 Open SVC Zaps correctly installed to the 4 IBM modules/Csects, an open of a non-VSAM data set will branch to our ADSMVS60 module.

Using a jobname of DMSTEST will activate a diagnostic facility within the SVC that displays applicable data used to determine if DSCB updates are to be made to maintain fields within the DSCB. That means, if our ADSMVS60 module is processed via a job named DMSTEST it will produce corresponding diagnostic messages.   

Note: IEFBR14 does not open a dataset. You may try for example with an IEBGENER.

Additional Information

System parameter SVCNODMS is obsolete. It was only used to document the number of the Disk SVC, but it is not needed in any processing. If SVCNODMS is not in SYSPARMS member, then this is ok. But if SVCNODMS is in SYSPARMS member, set to SVCNODMS252, then set it to 230 just for documentation purpose. The setting is not used for any Disk processing. 

For VSAM datasets Disk replaces the operating system's generic VSAM date stamp module (IDATMSTP). Use member USERMOD3 in the Disk installation library to replace the operating system's copy of IDATMSTP with the default Disk version. Refer to the Disk VSAM Date Stamp  for Installing the IDATMSTP Module and Testing the Installation of the IDATMSTP Module from the Disk tech guide.