Dynamic changes to coupling facility size
For VTAM® to dynamically
increase the coupling facility storage size, specify the following
on the structure policy statement:
- SIZE
- Specify the maximum allowed size for the structure.
- INITSIZE
- Specify the initial size of the structure. See Determining the size of the coupling facility structure for information about calculating the structure size.
Note: For VTAM to dynamically
alter the structure size, the SIZE value must be larger than the value
of INITSIZE. The structure alter process is initiated to change the
structure size when the current in-use percentage of total storage
reaches 90 percent and the maximum size is greater than the current
size. When the size has reached the value of SIZE attribute, the policy
must be changed and an alter or rebuild command issued to incorporate
the changes. Set the ALLOWAUTOALT parameter on the CFRM policy for VTAM or TCP/IP structures to ALLOWAUTOALT(NO)
(or allow the ALLOWAUTOALT parameter to default to NO) to prevent MVS™ attempts to resize the structure
from conflicting with VTAM re-sizing
events.