ERDSASZE

The ERDSASZE system initialization parameter specifies the size of the Extended Read-Only Dynamic Storage Area (ERDSA).

Setting the size of individual dynamic storage areas (DSAs) is not necessary and it is not recommended. If you specify DSA size values in combination that do not allow sufficient space for the remaining DSAs, CICS® fails to initialize. The limit on the storage available for the DSAs in 31-bit storage (above-the-line) is specified by the EDSALIM system initialization parameter. Allow at least 1 MB for each DSA in 31-bit storage for which you have not set a size. See the DSALIM system initialization parameter for more details. For information about CICS dynamic storage areas, see CICS dynamic storage areas (DSAs).

Defining ERDSASZE

You can define the ERDSASZE system initialization parameter in the following ways:

In the PARM parameter of the EXEC PGM=DFHSIP statement.
In the SYSIN data set of the CICS startup job stream.
Through the system console.

You cannot define the ERDSASZE system initialization parameter in the DFHSIT macro.

Values for ERDSASZE

ERDSASZE={0K|number}

Valid values for the ERDSASZE system initialization parameter are as follows:

0 (zero): 0 (zero) is the default value for ERDSASZE. The size of the ERDSA dynamic storage area size can change dynamically.
number: A non-zero value specifies that the size of the ERDSA dynamic storage area is fixed. Specify number as an amount of storage in the range 0 - 1073741824 bytes in multiples of 1048576 bytes (1 MB). If the value you specify is not a multiple of 1 MB, CICS rounds up the value to the next multiple.You can specify number as a number of bytes, a whole number of kilobytes, or a whole number of megabytes. Use the letter M to indicate that the value represents a whole number of megabytes (for example, 4 M). Use the letter K to indicate that the value represents a whole number of kilobytes (for example, 4096 K), in which case the number is rounded up to the number of megabytes.