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 

Questions:

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

Environment

Release: 12.5

Component: CA Disk SYSPARMS

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.

Explanation:

As per Product Documentation Change (PDC) RI77853:

**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:

  ARCHIV                             WRITTEN                DATA    BLOCK     K/M/G/T ID VOL FLAGS  COPY   TRUE   SEQ DEVICE   KEY     

  KEY    DATA SET NAME               TIME DATE      EXPDATE SETS    COUNT     BYTES   RC CNT 1 2 3  KEY    VOL    NO  TYP UNIT CHAIN  

 ------ ---------------------------- ------------- -------- ------- --------- ------- -- --- ------ ------ ------ --- -------- ------ 

 EW2884 TPRJT.D0060.DMSC.S2014339.   0101 2014.339 1999.365     189    590446  18.01G       1 004B00 EW2884          1 3490DYN2  

            T010100                                                                                                    DLMVSIZ3  

 EW2891 TPRJT.D0060.DMSC.S2014337.   2331 2014.337 1999.365    2311   1299678  39.61G       1 004B00 EW2891          1 3490DYN2  

            T233100                                                                                                    DLMVSIZ3  

 EW2895 TPRJT.D0060.DMSC.S2014338.   0101 2014.338 1999.365     189    590446  18.01G       1 004B00 EW2895          1 3490DYN2  

            T010107                                                                                                    DLMVSIZ3