To ensure that unauthorized users cannot access sensitive data, IBM® recommends that your installation use RACF®, or an equivalent security product, to protect the working space data sets.

You must allocate data sets on a volume in each storage subsystem that you are using for virtual concurrent copy. If you define more than one device type on the storage subsystem, you must allocate a working space data set on each device type that contains a data set that you intend to process using SnapShot or FlashCopy®.

You must allocate at least one working space data set, if a system or device type for concurrent copy operation runs simultaneously from more than one system and accesses data on the same storage subsystem. For example, you must allocate three working space data sets to process data on an RVA subsystem from three z/OS® systems, on devices of each device type containing data processed with concurrent copy.

The total size of all working space data sets that you allocate on each storage subsystem should be equal to or exceed the largest total amount of data to be processed in a single DFSMSdss COPY or DUMP operation on that storage subsystem. If there is insufficient space, the concurrent copy initialization for one or more data sets in the job fails.

For more information about virtual concurrent copy and working space data sets, refer to z/OS DFSMS Advanced Copy Services.