The various SF pubsets or volume sets of an SM pubset are assigned definable threshold values by systems support for monitoring storage bottlenecks. The highest exceeded level determines the actual saturation level, see also section “Monitoring storage space saturation”.
The threshold values for the various saturation levels are set with the SET-/MODIFY-SPACE-SATURATION-LEVEL command. The saturation levels can be modified temporarily or permanently with this command (operand SCOPE=*PERMANENT/ *TEMPORARY/*NEXT-PUBSET-SESSION).
The system storage space emergency reserve for a system start in ZIP mode can be set on a pubset-specific basis with the MODIFY-SPACE-SATURATION-LEVEL command. This is handled in the same way as saturation level 6.
The global system default for saturation level 4, which was set during system generation with the system parameter L4SPDEF, is effective for pubsets or volume sets for which no explicit definitions were made.
The saturation level settings can be retrieved with the SHOW-SPACE-SATURATION-LEVELS command for SF pubsets or with the operand VOLUME-SET=*ALL/<cat-id> for the volume sets of an SM pubset.
For compatibility reasons, the ADD- and MODIFY-MASTER-CATALOG-ENTRY commands provide restricted setting options for saturation level 4 for SF pubsets only.