Storage requirements for Db2 for z/OS

When you install or migrate Db2, consider the size of your site and how it will be set up to determine your storage needs.

You can use the installation CLIST to calculate your estimated storage needs. For details, see Calculating storage requirements with the installation CLIST.

The parameters that you specify when you run the installation CLIST affect the sizes of some data sets and the required amount of virtual storage. All data sets are linear data sets, with the exception of the bootstrap data set, which is a key-sequenced data set.

You can use Data Facility Storage Management Subsystem (DFSMS) to manage Db2 data sets. It provides automatic backup and recovery features, which might require disk storage beyond what is estimated below. Starting in DB2 10, data sets for the Db2 catalog and directory are managed by Db2 and must be SMS-managed. The SMS environment that you used for DB2 10 can be used for Db2 12. You are not required to convert existing Db2 catalog and directory data sets to the SMS environment before migrating to Db2 12. These data sets will be converted the next time the related table space is reorganized.