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
so that they exist only between resources within each tenant's scope of resources,
and limiting a tenant's Copy Services operators to an "operator only" role.
When managing a single-tenant installation, the partitioning capability of resource
groups can be used to isolate various subsets of an environment as if they were
separate tenants. For example, to separate mainframes from distributed system
servers, Windows from UNIX, or accounting departments from telemarketing.
Using resource groups to limit Copy Service operations
Figure 12 on page 79 illustrates one possible implementation of an exemplary
environment that uses resource groups to limit Copy Services operations. Two
tenants (Client A and Client B) are illustrated that are concurrently operating on
shared hosts and storage systems.
Each tenant has its own assigned LPARs on these hosts and its own assigned
volumes on the storage systems. For example, a user cannot copy a Client A
volume to a Client B volume.
Resource groups are configured to ensure that one tenant cannot cause any Copy
Services relationships to be initiated between its volumes and the volumes of
another tenant. These controls must be set by an administrator as part of the
configuration of the user accounts or access-settings for the storage system.
78 DS8880 Introduction and Planning Guide
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