Chapter 7. Sysplex functions 171
Draft Document for Review April 7, 2004 6:15 pm 6947ch07.fm
Sysplex cluster must be configured with redundant hardware (for example, a Coupling Facility
and a Sysplex Timer in each site), and the cross-site connections must be redundant.
Figure 7-8 GDPS/PPRC (no extended distance RPQ)
All critical data resides on storage subsystems in site 1 (the primary copy of data) and is
mirrored to site 2 (the secondary copy of data) via PPRC synchronous remote copy.
GDPS/PPRC is capable of the following attributes:
򐂰Continuous availability
򐂰Near-transparent disaster recovery
򐂰Recovery Time Objective (RTO) less than an hour
򐂰Recovery Point Objective (RPO) of zero (optional)
򐂰Protects against localized area disasters

GDPS/PPRC HyperSwap

The GDPS/PPRC HyperSwap function is designed to broaden the continuous availability
attributes of GDPS/PPRC by extending the Parallel Sysplex redundancy to disk subsystems.
The HyperSwap function can help significantly reduce the time needed to switch disks
between sites and the time to switch sites. GDPS/PPRC HyperSwap provides the ability to
transparently switch all primary PPRC disk subsystems with the secondary PPRC disk
subsystems for a planned or unplanned reconfiguration, as shown on Figure7-9.
CF01 CF02
Site 1 Site 2
Network
High Performance
Routing

Remote copy

(PPRC)

40km max
with DWDM
12
3
4
5
6
7
8
9
101112
12
3
4
5
6
7
8
9
101112
SW
SW
Primary disk
subsystems Secondary disk
subsystems
zSeries zSeries