Comparison Of Copy Services Features - IBM DS8882F Introduction And Planning Manual

Note: User and administrator roles for resource groups are the same user and
administrator roles used for accessing your DS8000 storage system. For example,
those roles include storage administrator, Copy Services operator, and physical
operator.
The process of planning and designing the use of resource groups for Copy
Services scope limiting can be complex. For more information on the rules and
policies that must be considered in implementing resource groups, see topics about
resource groups. For specific DS CLI commands used to implement resource
groups, see the IBM DS8000 Command-Line Interface User's Guide.

Comparison of Copy Services features

The features of the Copy Services aid with planning for a disaster.
Table 11 provides a brief summary of the characteristics of the Copy Services
features that are available for the storage system.
Table 11. Comparison of features
Feature Description
Multiple Target PPRC Synchronous and
asynchronous
replication
Metro/Global Mirror Three-site, long
distance disaster
recovery replication
Metro Mirror Synchronous data
copy at a distance
Global Copy Continuous copy
without data
consistency
Global Mirror Asynchronous copy
Advantages Considerations
Mirrors data from a Disaster recovery
single primary site to scenarios depend on
two secondary sites support from
simultaneously. controlling software
such as
Geographically
Dispersed Parallel
Sysplex (GDPS) and
IBM Copy Services
Manager
A backup site is Recovery point
maintained objective (RPO)
regardless of which might grow if
one of the sites is bandwidth capability
lost. is exceeded.
No data loss, rapid Slight performance
recovery time for impact.
distances up to 300
km.
Nearly unlimited Copy is normally
distance, suitable for fuzzy but can be
data migration, only made consistent
limited by network through
and channel synchronization.
extenders
capabilities.
Nearly unlimited RPO might grow
distance, scalable, when link bandwidth
and low RPO. The capability is
RPO is the time exceeded.
needed to recover
from a disaster; that
is, the total system
downtime.
Chapter 3. Data management features
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