What is the maximum virtual storage that you want HFS data and meta data buffers to use? Choose the default, which means that 50% of real storage is available at IPL, or specify how many megabytes of virtual storage (from 32 to 128000) you want to have used. Take into consideration the virtual storage limitations at your installation. This sets the VIRTUAL(max) parameter (PARM) on the FILESYSTYPE TYPE (HFS) statement in the BPXPRMxx member.