As the first step, list all the tablespaces and check the space usage and also list the objects in the tablespaces from the database level. Not sure how the DB2 handles tablespaces during upgrade/update but for Oracle it will prompt for the tablespace creation using the BR*Tools. If there is already a tablespace which matches the release ID of the system then a tablespace with the similar name with an X at the end will be suggested on Oracle.
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