IBM 990 User Manual
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IBM
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zSeries 990 Technical Guide
Figure 7-9 HyperSwap
Planned HyperSwap
GDPS/PPRC planned HyperSwap provides:
The ability to switch all primary PPRC disk subsystems with the secondary PPRC disk
subsystems for a planned reconfiguration and enables disk configuration maintenance
and planned site maintenance without requiring any applications to be quiesced.
Production systems and workload to remain active during maintenance of the site
containing the primary PPRC disk subsystems, if applications are cloned and exploiting
data sharing across the two sites.
See GDPS: The e-business Availability Solution, GF22-5114
for benchmark measurements
of switch times, found at:
Unplanned HyperSwap
GDPS/PPRC unplanned HyperSwap allows:
Production systems and workload to remain active during a disk subsystem failure. Disk
subsystem failures will no longer constitute a single point of failure for an entire sysplex.
Production systems to remain active during a failure of the site containing the primary
PPRC disk subsystems, if applications are cloned and exploiting data sharing across the
two sites. Even though the workload in the second site will need to be restarted, an
improvement in the Recovery Time Objective (RTO) will be accomplished.
See GDPS: The e-business Availability Solution, GF22-5114
for benchmark measurements
of switch times, found at
The GDPS/PPRC HyperSwap function is an integration of IBM
^
and TotalStorage
technologies. It integrates enhancements to GDPS code, z/OS, and ESS Licensed Internal
Code.
P
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application
application
UCB
PPRC
UCB