EMC Symmetrix DMX-3, Product Manual

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236 EMC Symmetrix DMX-3 Product Guide
Mainframe Features and Support
Figure 54
PPRC and GDPS support
XRC support Enginuity level 5772 supports IBM’s XRC, level 3 functionality. IBM
designed XRC as a host-based disaster recovery and workload
migration solution that provides asynchronous copying of zSeries
data to a remote data center.
With XRC, a remote site has a point-in-time copy of the
source/primary data with the following attributes:
◆
The copy at the remote site is not the most current one; there is a
lag between the local and remote copies.
◆
The remote copy’s data is re-startable.
◆
Since this is an asynchronous solution, write operations do not
suffer from performance degradation while transferring the data
across the link.
XRC provides update sequence integrity through its mechanism of
consistency groups, and journal, control, and state data sets. The
basic concept is that the System Data Mover (SDM) polls, or receives
attention interrupts from, the primary control units it is servicing and
retrieves from them all new or updated records.
SRDF SRDF
Primary s ite
Recovery s ite
Automated site failover via
compiled REXX “Scripts”
Symmetrix Fully PPRC
Command Compliant
A u tom a ted s ite f a ilover
compiled REXX “S cript s”
Symmetrix PPRC
Command Compatibility
S YM-000092
R1 R1
PPRC commands
converted to SRDF
PPRC command s
converted to S RDF
PPRC commands
converted to SRDF
PPRC command s
converted to S RDF
R1 R1
R2
R2
R2
R2