Advanced Copy Services, offered on IBM® TotalStorage Enterprise Storage Server® (ESS), consists of the following individual functions
and enhancements:
- Remote copy, which consists of the following:
- Extended Remote Copy (XRC): XRC is a combined
hardware and software solution that offers the highest levels of continuous
data availability in a disaster recovery and workload movement environment.
Offered on the ESS, XRC provides an asynchronous remote copy solution,
of both system-managed and non-system-managed data, to a second, remote
location.
- Coupled extended remote copy (CXRC) and Multiple Extended Remote Copy (MXRC): You can use
CXRC and MXRC in large environments that have an expanded number of
primary storage controls and DASD volumes, in excess of those supported
by a single data mover configuration.
- Peer-to-Peer Remote Copy (PPRC): PPRC is
a hardware solution to rapid and accurate disaster recovery as well
as a solution to workload and DASD migration.
- FlashCopy®: FlashCopy is
a point-in-time copy services function that can quickly copy data
from a source location to a target location.
- Global Mirror: Global Mirror is
a disaster recovery environment that uses a combination of PPRC and
FlashCopy to maintain consistent up-to-date volumes at the remote
disaster recovery site.
- Concurrent copy: Concurrent copy is a copy
services function that generates a copy of data while applications
are updating that data.
- SnapShot copy: SnapShot copy is an Advanced
Copy Services function offered on the RAMAC Virtual
Array (RVA) Storage Subsystem. SnapShot is a point-in-time copy services
function that allows you to “snap” (quickly copy) data directly
from the source location to a target location.
Many of these functions rely on the System Data Mover (SDM). The
SDM is the high-speed data transfer engine behind the Extended Remote
Copy, SnapShot, and concurrent copy functions. Peer-to-Peer Remote
Copy does not rely on the SDM for data movement.
Related reading: For further information
on Advanced Copy Services, see z/OS DFSMS Advanced Copy Services.
z/OS DFSMS Introduction
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