Extend function restrictions

• Multiple area data sets (MADS) are not supported for the offline Extend function.

• If you extend IOVF when SDEPs are present in the area, a reorganization of all UOWs will occur.

DEBD maintenance requirements

The following maintenance requirements apply to the offline Extend function when you increase the size of IOVF and SDEP storage portions of a DEDB:

• After extending IOVF, you must update the DBD and ACB with the increased ROOT size when the extend for IOVF has been committed because the ACB is not updated with the increased ROOT parameter.

  If the ACB is not updated and the area is recovered, reloaded, or reinitialized to a smaller-sized IOVF, IMS will not bring the area data set online.

• After extending SDEP, you might need to change your area data set VSAM cluster definition to allow for the extended size of the SDEP portion the next time that you perform maintenance on the DEBD.