You must ensure that the VTOC is indexed and that adequate space is available in the VVDS to contain the updates to the VSAM volume records (VVRs) and NVR records that are built for the non-VSAM data sets.

Use the TEST option of DFSMSdss's CONVERTV function to verify that your volume and data sets are eligible to be placed under system management.

You can use the ISMF Data Set Application to identify ineligible data sets before you perform the in-place conversion. This is described in Enabling the Software Base for System-Managed Storage. Also, you can use CONVERTV as a line operator from the ISMF Volume Application to build the job that performs the volume migration. Running CONVERTV with the TEST keyword simulates the migration to system-managed storage, letting you evaluate the eligibility of your volume without actually migrating the data. Be aware that the simulation reports on permanent, rather than transient, error conditions. As an example, data sets that cannot be serialized are not reported as exceptions during the simulation.

Related Reading: For more information on using the CONVERTV command, see z/OS DFSMSdss Storage Administration.