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510 IBM System Storage DS6000 Series: Copy Services with IBM System z
Concurrent Copy
This appendix describes the characteristics and operation of Concurrent Copy. We also
discuss the considerations involved when planning to use Concurrent Copy.
The information presented in this chapter can be complemented with the following
publications:
z/OS DFSMS Advanced Copy Services, SC35-0428
z/OS DFSMSdss Storage Administration Reference, SC35-0424
z/OS V1R3.0 DFSMS Installation Exits, SC26-7396
DFSMS: Implementing System Managed Storage, SC26-7407
DFSMShsm Storage Administration Guide, SC35-0388
DFSMS/MVS Managing Catalogs, SC26-4914
Overview
Concurrent Copy is a copy function that helps you keep your high data availability objectives
by allowing point-in-time copies of your data
concurrent with normal application processing.
Concurrent Copy works with the IBM System Storage DS6000 and the DFSMS System Data
Mover (SDM). Concurrent Copy is available for the z/OS and OS/390 operating systems, and
requires software support provided in DFSMS/MVS™.
Concurrent Copy works not only on a full-volume basis, but also at a data set level. Also, the
target is not restricted only to DASD volumes in the same DS6000, but the target can also be
a tape cartridge or a DASD volume on another DS6000 (see Figure A-1).
Figure A-1 Concurrent Copy characteristics
Concurrent Copy terminology
This section lists the definitions of the terms used with Concurrent Copy. These terms are
discussed in detail in the following sections.
- DFSMS/MVS Data Mover is used to
move the data
- Sidefile in cache is used for the updates
- Up to 64 Concurrent Copy sessions at a
time
T0 copy/dump of a volume or data set:
OS/390 and z/OS function
Backups of data at time T0
while source can be modified
Concurrent Copy and the
DS6000:
Data
Mover
Sidefile
Data set /
Volume
Data set /
Volume
Tape