functions, including Remote Mirror, Remote Copy, and Point-in-Time
functions. The following includes key Copy Service functions:
v FlashCopy
v Remote Pair FlashCopy (Preserve Mirror)
v Safeguarded Copy
v Remote Mirror and Copy:
– Metro Mirror
– Global Copy
– Global Mirror
– Metro/Global Mirror
– Multi-Target PPRC
– z/OS Global Mirror
– z/OS Metro/Global Mirror
Multitenancy support (resource groups)
Resource groups provide additional policy-based limitations. Resource
groups, together with the inherent volume addressing limitations, support
secure partitioning of Copy Services resources between user-defined
partitions. The process of specifying the appropriate limitations is
performed by an administrator using resource groups functions. DS CLI
support is available for resource groups functions.
Multitenancy can be supported in certain environments without the use of
resource groups, if the following constraints are met:
v Either Copy Services functions are disabled on all DS8000 systems that
share the same SAN (local and remote sites) or the landlord configures
the operating system environment on all hosts (or host LPARs) attached
to a SAN, which has one or more DS8000 systems, so that no tenant can
issue Copy Services commands.
v The z/OS Distribute Data backup feature is disabled on all DS8000
systems in the environment (local and remote sites).
v Thin provisioned volumes (ESE or TSE) are not used on any DS8000
systems in the environment (local and remote sites).
v On zSeries systems there is only one tenant running in an LPAR, and the
volume access is controlled so that a CKD base volume or alias volume
is only accessible by a single tenant’s LPAR or LPARs.
I/O Priority Manager
The I/O Priority Manager function can help you effectively manage quality
of service levels for each application running on your system. This function
aligns distinct service levels to separate workloads in the system to help
maintain the efficient performance of each DS8000 volume. The I/O
Priority Manager detects when a higher-priority application is hindered by
a lower-priority application that is competing for the same system
resources. This detection might occur when multiple applications request
data from the same drives. When I/O Priority Manager encounters this
situation, it delays lower-priority I/O data to assist the more critical I/O
data in meeting its performance targets.
Use this function to consolidate more workloads on your system and to
ensure that your system resources are aligned to match the priority of your
applications.
The default setting for this feature is disabled.
26 DS8880 Introduction and Planning Guide
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