Removing DLMVSIZn sysparms

Products

• DISK BACKUP AND RESTORE

Issue/Introduction

Following sysparms are specified in the Sysparms member 

DLMVSIZ100000002GB DLM TAPE SIZE = 2GB
DLMVSIZ200002252MB DLM TAPE SIZE = 2.2GB
DLMVSIZ300000030GB DLM TAPE SIZE = 30GB 

Can sysparms DLMVSIZ1 and DLMVSIZ2 be removed if they are no longer used?
And, after removing them, can DLMVSIZ3 be renamed to DLMVSIZ1?

Resolution

With following sysparms set in the SYSPARMS member:

DLMVSIZ100000002GB DLM TAPE SIZE = 2GB
DLMVSIZ200002252MB DLM TAPE SIZE = 2.2GB
DLMVSIZ300000030GB DLM TAPE SIZE = 30GB  

and a LISTV VOL=/  not showing any DLMVSIZ1 or DLMVSIZ2, only DLMVSIZ3
only then DLMVSIZ1 and DLMVSIZ2 can be removed. 

But DLMVSIZ3 must remain as it is as long it is referenced in any Archvol.

The name of sysparm DLMVSIZ3 cannot be changed or removed as long as it is in use.

Additional Information

Explanation:

**CAUTION** Changing the size of the same DLMVSIZx Sysparm from one value to another should not be done without considering existing ARCHVOL records.

For example, if DLMVSIZ2 has been defined as 280GB, changing this value to 300GB could cause problems for any existing ARCHVOL record(s) that used that value.
It would be safer to define a new Sysparm with the desired size. In this example, defining DLMVSIZ3 with a value of 300GB would be the safest thing to do.
To verify if a DLMVSIZx Sysparm is in use, a second line has been added to the LISTV report showing the applied Sysparm. 

A LISTV will show for example: