Explanation: DAYS(days) is an optional parameter specifying how many consecutive days that data sets on migration level 1 volumes are to remain inactive before they are eligible for migration. For days, substitute a decimal number from 0 to 999.
Defaults: If you do not specify DAYS(days), DFSMShsm migrates the data sets from the volume based on the current DFSMShsm value for the MIGRATIONLEVEL1DAYS parameter of the SETSYS command.