Conditions preventing a system-initiated alter

System-Initiated alter processing may not start an alter for an eligible structure when any of the following conditions exist:

A previously initiated Alter (either system-initiated or initiated by other means) is already in progress for the structure or has recently completed (with alter related events still pending delivery to structure exploiters).
A cache structure's total in use (changed and unchanged) percentage of directory entries exceeds 95%, but the entry/element ratio exceeds a value of 255:1.
A structure is already at the maximum size defined by the CFRM policy and the entry/element ratio exceeds a value of 255:1..
A structure is already at the maximum size defined by the CFRM policy and the current utilization of entries and elements does not require a ratio change (the currently allocated ratio of structure objects is in line with the ratio of structure objects currently being used).
A structure is already at the maximum size defined by the CFRM policy and the target entry/element ratio calculated by the system-initiated alter processing is equal to the ratio requested on the last alter or allocation request, regardless of whether or not that alter process attained its targets.
A list structure is already at the maximum SIZE defined by the CFRM policy and the target entry/element ratio and the EMC storage percentage calculated by the system-initiated alter processing is equal to the ratio and EMC storage percentage requested on the last alter or allocation request, regardless of whether or not that alter process attained its targets.
A structure's current utilization of entries and elements does not require a ratio change (the currently allocated ratio of structure objects is in line with the ratio of structure objects currently being used) and there is no free space in the coupling facility into which to expand the structure.
A coupling facility as a whole is above 90% full and an eligible structure within that coupling facility contains monitored objects that are not above the structure full threshold specified by FULLTHRESHOLD, but one or more of the monitored object types are sufficiently close to the structure full threshold that an alter initiated to contract the structure might push one or more of the monitored objects over the full threshold value.
A coupling facility as a whole is above 90% full and an eligible structure within that coupling facility contains monitored objects that are not above the structure full threshold specified by FULLTHRESHOLD, but the currently allocated structure size is sufficiently small that an alter initiated to contract the structure might push one or more of the monitored objects over the full threshold value.

See topic Requesting structure size for more information about requesting the size for structures. See topic CFRM parameters for administrative data utility for more information about specifying structure sizes in the CFRM policy.