Db2 directory storage requirements

The amount of directory space required for the Db2 directory depends mainly on the number of user databases, application plans and packages, and tables in the Db2 subsystem.

Data sets for the Db2 catalog and directory are managed by Db2 and must be SMS-managed. The SMS environment that you use for Db2 catalog and directory data sets must be established before you begin installation or migration to Db2 13. The SMS environment must include a data class for allocating the data sets in extended format and using extended addressability. You are not required to convert existing Db2 catalog and directory data sets to the SMS environment before migrating to Db2 13. These data sets will be converted the next time the related table space is reorganized.

A typical site requires about 808 cylinders for the Db2 directory.