IBM DS8882F, Introduction And Planning Manual

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Manually using external software (without Global Mirror)
You can use Metro Mirror, Global Copy, and FlashCopy functions to create
a consistent and restartable copy at your recovery site. These functions
require a manual and periodic suspend operation at the local site. For
instance, you can enter the
freeze and run commands with external
automated software. Then, you can initiate a FlashCopy function to make a
consistent copy of the target volume for backup or recovery purposes.
Automation software is not provided with the storage system; it must be
supplied by the user.
Note: The freeze operation occurs at the same point-in-time across all
links and all storage systems.
Automatically (with Global Mirror and FlashCopy)
You can automatically create a consistent and restartable copy at your
intermediate or remote site with minimal or no interruption of
applications. This automated process is available for two-site Global Mirror
or three-site Metro / Global Mirror configurations. Global Mirror
operations automate the process of continually forming consistency groups.
It combines Global Copy and FlashCopy operations to provide consistent
data at the remote site. A master storage unit (along with subordinate
storage units) internally manages data consistency through consistency
groups within a Global Mirror configuration. Consistency groups can be
created many times per hour to increase the currency of data that is
captured in the consistency groups at the remote site.
Note: A consistency group is a collection of session-grouped volumes
across multiple storage systems. Consistency groups are managed together
in a session during the creation of consistent copies of data. The formation
of these consistency groups is coordinated by the master storage unit,
which sends commands over remote mirror and copy links to its
subordinate storage units.
If a disaster occurs at a local site with a two or three-site configuration,
you can continue production on the remote (or intermediate) site. The
consistent point-in-time data from the remote site consistency group
enables recovery at the local site when it becomes operational.
Resource groups for Copy Services scope limiting
Resource groups are used to define a collection of resources and associate a set of
policies relative to how the resources are configured and managed. You can define
a network user account so that it has authority to manage a specific set of
resources groups.
Copy Services scope limiting overview
Copy services scope limiting is the ability to specify policy-based limitations on
Copy Services requests. With the combination of policy-based limitations and other
inherent volume-addressing limitations, you can control which volumes can be in a
Copy Services relationship, which network users or host LPARs issue Copy
Services requests on which resources, and other Copy Services operations.
Use these capabilities to separate and protect volumes in a Copy Services
relationship from each other. This can assist you with multitenancy support by
assigning specific resources to specific tenants, limiting Copy Services relationships
Chapter 3. Data management features
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