The system applies the parameters in IGGCATxx, LOADxx, and SYSCATxx in the following order:

1. Parmlib member IGGCATxx, if specified, takes the highest priority, followed by...
2. Parmlib member LOADxx followed by...
3. SYSCATxx member of SYS1.NUCLEUS followed by...
4. System defined defaults

Table 1. Intersection of SYSCATxx, LOADxx, IGGCATxx, and MODIFY CATALOG command

Keyword	Attribute	IGGCATxx	LOADxx	SYSCATxx	MODIFY CATALOG
	Master catalog name	No	Yes	Yes	No
	Master catalog type	No	Yes	Yes	No
	Master catalog volume	No	Yes	Yes	No
ALIASLEVEL	Number of data set name qualifiers to be used in the multilevel alias facility catalog search	Yes	Yes	Yes	Yes
ALLOCLCK	Contention detection settings for ALLOCLCK resource	Yes	No	No	CONTENTION
AUTOADD	AUTOADD function	Yes	Yes	Yes	ECSHR
CATMAX	Maximum number of catalogs that can be opened concurrently in CAS	Yes	No	No	Yes
DELFORCEWNG	Warning message IDC1997I or IDC1998I	Yes	No	No	ENABLE | DISABLE
DELRECOVWNG	Warning message IDC1999I	Yes	No	No	ENABLE | DISABLE
DSNCHECK	Syntax checking on names being added to a catalog	Yes	No	No	ENABLE | DISABLE
DUMPOFF DUMPON	CAS dynamic dumping	Yes	No	No	Yes
EXTENDEDALIAS	Ability to create extension records for user catalog aliases on the current system	Yes	No	No	ENABLE | DISABLE
GDGFIFOENABLE	FIFO ordering of GDG	Yes	No	No	No
NOTIFYEXTENT	Monitor percentage of the maximum extents possible for a currently allocated catalog	Yes	No	No	Yes
SYMREC	Creation of SYMREC records	Yes	No	No	ENABLE | DISABLE
SYS%OFF SYS%ON	SYS% conversion	Yes	No	Yes	Yes
SYSIGGV2	Contention detection settings for SYSIGGV2 resource	Yes	No	No	CONTENTION
SYSZTIOT	Contention detection settings for SYSZTIOT resource	Yes	No	No	CONTENTION
SYSZVVDS	Contention detection settings for SYSZVVDS resource	Yes	No	No	CONTENTION
TAPEHLQ	Tape volume catalog high level qualifier	Yes	Yes	Yes	No
TASKMAX	Maximum number of concurrent user service tasks	Yes	No	No	Yes
TASKMIN	CAS service task lower limit (minimum number of CAS service tasks or requests)	Yes	Yes	No	Yes
TASKTABLESIZE	CAS task table size	Yes	No	Yes	No
UPDTFAIL	Warning message IEC390I	Yes	No	No	ENABLE | DISABLE
VVDSSPACE	Catalog volume data set space allocation	Yes	No	No	Yes
VVRCHECK	Enhanced VVR checking on VVDS I/O	Yes	No	No	ENABLE | DISABLE

If you wish to suppress the IEA347A message that prompts for the master catalog name at IPL time, you must use the LOADxx member. Note that this means that the system uses the default TASKTABLESIZE value. If you want a larger TASKTABLESIZE , you must specify it in the SYSCATxx parmlib member and you cannot supress the IPL prompt.