When you delete a DASD volume from a storage group, first set the volume status to DISNEW. This prevents any new allocations to the volume while allowing existing data sets to still be accessed with DISP=SHR, DISP=MOD, or DISP=OLD. Move any data that you do not want converted to non-SMS from the volume. Next, if the DASD volume is to be reused as a non-SMS-managed volume, run a DFSMSdss NONSMS CONVERTV to convert it out of SMS. Finally, remove the volume from the storage group.

To remove DASD volumes from a storage group, select the Storage Group Application Selection panel. Specify the CDS name and the storage group name that contains the volumes you want to delete. Press Enter to get the Storage Group Volume Selection panel. From the Storage Group Volume Selection panel, indicate the volumes you want to delete in the SPECIFY A SINGLE VOLUME (in PREFIX), OR RANGE OF VOLUMES field, select option 4, and press Enter. Be careful when moving or removing a volume from a storage group because the volume could contain part of a multivolume data set. The changes take effect when you activate this updated configuration.

To prevent DFSMShsm from attempting to allocate to volumes which have been deleted from the storage group, issue the DFSMShsm DELVOL command from all DFSMShsm systems which are aware of the deleted volume.

After deletion, the DASD volume is only eligible for non-SMS allocations. However, if you are reassigning the volume to another storage group, you need to define the volume to the storage group and then activate the updated configuration.