The type of data compression can be specified for save files using the following commands:
To override the save file data compression:
CALL PGM(QBRM/Q1AOLD) PARM('PARMOVR' '*ADD' 'SAVFDTACPR' '*xxxxxxxx')
where '*xxxxxxx' is:
*HIGH
*MEDIUM
*LOW
*YES
*NO
*DEV
*ZLIB (additional option for IBM i 7.4 and later)
To remove the save file data compression override:
CALL PGM(QBRM/Q1AOLD) PARM('PARMOVR' '*REMOVE ' 'SAVFDTACPR')
To display the save file data compression override:
CALL PGM(QBRM/Q1AOLD) PARM('PARMOVR' '*DISPLAY' 'SAVFDTACPR')
Using Software Compression for Tape and Optical
IBM i 7.5 and IBM i 7.4 has enabled software data compression for tape, optical, virtual tape and virtual optical.
The following PTFs are required to enable software data compression support for tape, optical, virtual tape and virtual optical:
7.5
5770SS1-SI84525
5770999-MF71323
5770BR1-SI84643
7.4
5770SS1-SI84526
5770999-MF71322
5770BR1-SI84629
For additional details reference Compression with ZLIB Algorithm.
The type of software data compression used by BRMS can be specified for backup to tape, optical, virtual tape and virtual optical using the DTACPR command detailed below:
To override the device data compression:
CALL PGM(QBRM/Q1AOLD) PARM('PARMOVR' '*ADD' 'DEVDTACPR' '*xxxxxxxx')
where '*xxxxxxx' is:
*HIGH
*MEDIUM
*LOW
*YES
*NO
*DEV
*ZLIB (7.4 and later)
To remove the device data compression override:
CALL PGM(QBRM/Q1AOLD) PARM('PARMOVR' '*REMOVE ' 'DEVDTACPR')
To display the device data compression override:
CALL PGM(QBRM/Q1AOLD) PARM('PARMOVR' '*DISPLAY' 'DEVDTACPR')