ABCs of z/OS System Programming Volume 3 - IBM Redbooks

1.4 DFSMSdss component
DFSMSdss provides the following functions:
Data movement and replication
Space management
Data backup and recovery
Data set and volume conversion
Distributed data management
FlashCopy feature with Enterprise Storage Server
(ESS)
SnapShot feature with RAMAC Virtual Array (RVA)
Concurrent copy
Figure 1-4 DFSMSdss functions
DFSMSdss component
DFSMSdss is the primary data mover for DFSMS. DFSMSdss copies and moves data to help
manage storage, data, and space more efficiently. It can efficiently move multiple data sets
from old to new DASD. The data movement capability that is provided by DFSMSdss is useful
for many other operations, as well. You can use DFSMSdss to perform the following tasks.
Data movement and replication
DFSMSdss lets you move or copy data between volumes of like and unlike device types. If
you create a backup in DFSMSdss, you can copy a backup copy of data. DFSMSdss also can
produce multiple backup copies during a dump operation.
Space management
DFSMSdss can reduce or eliminate DASD free-space fragmentation.
Data backup and recovery
DFSMSdss provides you with host system backup and recovery functions at both the data set
and volume levels. It also includes a stand-alone restore program that you can run without a
host operating system.
Data set and volume conversion
DFSMSdss can convert your data sets and volumes to system-managed storage. It can also
return your data to a non-system-managed state as part of a recovery procedure.
Chapter 1. DFSMS introduction 7