Configuring Your Product › Tailoring and Other Considerations › Archive/Backup Considerations › Using CA Compress within the Archives

Using CA Compress within the Archives

CA Disk users who are licensed to use CA's CA Compress product can use CA Compress to compress the CA Disk archives. If CA Compress is installed on your system, follow the following steps to implement this compression method.

1. Create a CA Compress File Description Table (FDT) to use when archiving/backing up data. To do this, create a CA Disk backup tape (NOT a disk data set) from a normal CA Disk backup run, but without using data compression (that is, sysparm DCDATACP specified with a value of N). Use this backup tape as input to the CA Compress File Prepass Utility. For specific instructions on creating the FDT, see the CA Compress for MVS User Guide.
2. Convert the FDT to load module format using the CA Compress FDTLOADR Utility. Give the FDT an 8-character name ("DMSOSFDT" is recommended) and place it in the CA Disk load library. For specific instructions on using the CA Compress FDTLOADR Utility, review the CA Compress for MVS User's Guide.
3. Specify sysparm SHRNKFDT with the value of the FDT name.

   Note: The default value for this sysparm is DMSOSFDT. If you have specified this name as the name of the CA Compress FDT in the load library (step 2 previous), it is not necessary to specify this sysparm.

   If you specified a different name, provide your name as the value for this sysparm in member SYSPARMS in the CA Disk PARMLIB.

4. Link the CA Compress interface with CA Disk using the following JCL.

   Note: If you install a new version of CA Compress, you must relink this interface. The JCL and control statements are provided in member RELKSHRK of the installation library.

   //JOBNAME  JOB (ACCT INFO)
   //* ****************************************************************
   //* * RELINK CA Disk MODULES FOR SHRINK COMPRESSION              *
   //* ****************************************************************
   //S1LKED   EXEC PGM=IEWL,PARM=(LIST,LET),REGION=3072K
   //SYSPRINT  DD  SYSOUT=*
   //SYSLMOD   DD  DISP=SHR,DSN=CA.DISK.LOADLIB
   //SYSLIB    DD  DISP=SHR,DSN=CA.DISK.ACUWMOD0
   //SHRINK    DD  DISP=SHR,DSN=CA.DISK.COMPRESS.LOADLIB
   //SYSUT1    DD  UNIT=SYSDA,SPACE=(1024,(50,20))
   //SYSLIN    DD  *
    INCLUDE SYSLIB(ADSUT410)
    INCLUDE SHRINK(SHRKEXPD)
    ENTRY ADSUT410
    NAME ADSUT410(R)
    INCLUDE SYSLIB(ADSUT411)
    INCLUDE SHRINK(SHRKEXPD)
    ENTRY ADSUT411
    NAME ADSUT411(R)
   /*
   

5. Concantenate the CA Compress load library to the CA Disk load library within the following PROCS:
   • DMS
   • DMSAR
   • FMS
   • RECOVER
   • RESTORE

   This ensures the CA Compress utilities are available to CA Disk, if needed.

6. Exempt all CA Compress-controlled data sets from compression during archival or backup processing. This can be accomplished either by placing the data set names or patterns in a data compression exclusion table as a PARMLIB member and specifying sysparm DCEXCTBL with the name of the PARMLIB member, or by using the CA Disk user exit DCDSNDEX.

   The reason for excluding these data sets is that files already compressed are not compressed any further when archived or backed up. Excluding them from compression during archive or backup processing decreases CPU overhead and improves performance.

7. Specify the following required data compression sysparms:

1. Optionally, you can specify the following data compression sysparms:

Note: You cannot change or delete the FDT once you have compressed CA Disk archive files using CA Compress Data.