Data set requirements for a data set separation profile

The profile data set has these requirements:

Organization can be either sequential or partitioned
Record format must be fixed or fixed-block (RECFM=FB).
It must be cataloged. Catalog the profile data set in the MASTERCAT to avoid a deadlock between SMS and CATALOG during IPL with contention in the SMS ASID, or a SYSZTIOT might occur.

When modifying the profile, use a disposition of OLD (DISP=OLD). The data in the profile might be corrupted if you use a disposition SHR.