The SMS copy pool backup storage group type contains the candidate target volumes for DFSMShsm fast replication requests. The volumes associated with a copy pool backup storage group are for DFSMShsm use. If you need to restrict use of a volume in a copy pool backup storage group, vary the volume off-line.
The Copy Pool Backup SG Name field, in the SMS storage group definition, is provided for you to specify the name of the backup storage group associated with the copy pool. You can associate a backup storage group with a copy pool storage group only. You can define a copy pool storage group with its own backup storage group or to with a backup storage group that is shared by multiple copy pool storage groups.
For each source volume in a storage group to be copied, enough eligible target volumes must exist in the copy pool backup storage group to satisfy the number of volumes required by the number of specified backup versions.
When the space efficient FlashCopy® function is enabled, space efficient volumes defined in a copy pool backup storage group are eligible FlashCopy target volumes for a copy pool defined with a VERSIONS value of 0 (NOCOPY mode). Space efficient FlashCopy is supported in NOCOPY mode only. Do not assign space efficient volumes to a copy pool backup storage group associated with a copy pool defined with a VERSIONS value of 1 to 85 (COPY mode).
For more information about the copy pool backup storage group type and the pool storage group, see z/OS DFSMSdfp Storage Administration.