Defining a new file system that is always compressed

The IOEFSPRM configuration option format_compression=on indicates a global default that is used by all formatting methods when determining the default compression behavior while formatting a new file system. This global compression default can be overridden by specifying the -nocompress keyword.

If IOEFSPRM configuration option format_compression=off is specified, all formatting methods can explicitly specify the -compress keyword to format the file system with compression.

The following example is JCL for defining and compressing a new aggregate.

//ZDEFFMT  JOB ,'DEF FORMAT COMPRESS',
//             MSGCLASS=H,
//             CLASS=A,
//             TIME=(1440),MSGLEVEL=(1,1)
//*---------------------------------------------------
//*  DEFINE FORMAT COMPRESS 
//*---------------------------------------------------
//*
//DEFINE   EXEC PGM=IDCAMS
//SYSPRINT DD SYSOUT=H
//SYSUDUMP DD SYSOUT=H
//AMSDUMP  DD SYSOUT=H
//DASD0    DD DISP=OLD,UNIT=3390,VOL=SER=SMBRS3
//SYSIN    DD *
     DEFINE CLUSTER (NAME(SUIMGNS.HIGHRISK.TEST) -
     ZFS CYL(2 0) SHAREOPTIONS(3))
/*
//CREATE   EXEC PGM=IOEFSUTL,REGION=0M,
// PARM=('format -aggregate SUIMGNS.COMPRESS.TEST -compress')
//SYSPRINT DD SYSOUT=H
//STDOUT   DD SYSOUT=H
//STDERR   DD SYSOUT=H
//SYSUDUMP DD SYSOUT=H
//CEEDUMP  DD SYSOUT=H

The following example uses the zfsadm format command with the -compress option to compress the new file system.

zfsadm format -aggregate PLEX.DCEIMGNJ.ENC -compress
 IOEZ00077I HFS-compatibility aggregate PLEX.DCEIMGNJ.ENC was successfully created.