The following diagram shows how custom-sized volumes (CVs) are created. First you delete the LDEVs being used to create free space, and then you can create one or more CVs of any size in that free space.
The following diagram shows how LDEVs (CVs) are created on the storage system.
You can create multiple LDEVs at once, for example, when you are setting up your storage system. After the storage system is set up, you can add LDEVs as needed.
Before you can create an LDEV in a storage system, you might need to create free space. Before deleting volumes to create free space, make sure that the selected mainframe volumes are disconnected from the host and do not contain data that might be required later.
When creating volumes, the LDEV ID (LDKC:CU:LDEV) and SSID must be specified. For the SSID, make sure to set a value in the range specified for SSIDs (0004 to FEFF for I-2107 CU emulation). If you set a value outside the specified range, mainframe hosts might not be able to use the LDEV.