Using Compression for BRMS Save Files

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 one of the options:

Options for 5770-BR1 7.5 and 5770-BR2 7.4 and later:

*HIGH
*MEDIUM
*LOW
*YES
*NO
*DEV
*ZLIB

Options for 5770-BR1 7.4 and earlier releases

*HIGH
*MEDIUM
*LOW
*YES
*NO
*DEV

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 one of the options:

Options for 5770-BR1 7.5 and 5770-BR2 7.4 and later:

*HIGH
*MEDIUM
*LOW
*YES
*NO
*DEV
*ZLIB

Options for 5770-BR1 7.4 and earlier releases

*HIGH
*MEDIUM
*LOW
*YES
*NO
*DEV

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')