Interaction With Other Features; Storage Partitioning; Flashcopy Logical Drives - IBM System Storage DS3000 Programming Manual

This example shows how to use the command in a script file:
remove VolumeCopy target ["Obi_1"];

Interaction with Other Features

You can run the VolumeCopy premium feature while running the following premium features:
v Storage Partitioning
v FlashCopy Logical Drive
v Enhanced Remote Mirroring
When you are running the VolumeCopy feature with other premium features, you must consider the
requirements of other premium features to help make sure that you set up a stable storage subsystem
configuration.
In addition to the premium features, you also can run the VolumeCopy feature while running Dynamic
Logical Drive Expansion (DVE).

Storage Partitioning

Storage Partitioning is a premium feature that lets hosts share access to logical drives in a storage
subsystem. You create a storage partition when you define any of these logical components in a storage
subsystem:
v A host
v A host group
v A Volume-to-LUN mapping
The Volume-to-LUN mapping lets you define which host group or host has access to a particular logical
drive in the storage subsystem.
After you create a logical VolumeCopy, the target logical drive automatically becomes read-only to hosts
to make sure that the data is preserved. Hosts that have been mapped to a target logical drive do not
have write access to the logical drive, and any attempt to write to the read-only target logical drive
results in a host I/O error.
If you want hosts to have write access to the data on the target logical drive, use the set VolumeCopy
command to disable the Read-Only attribute for the target logical drive.

FlashCopy Logical Drives

A FlashCopy logical drive is a point-in-time image of a logical drive. It is usually created so that an
application, such as a backup application, can access the FlashCopy logical drive and read the data while
the base logical drive stays online and is accessible to hosts.
The logical drive for which the point-in-time image is created is known as the base logical drive and
must be a standard logical drive in the storage subsystem. The FlashCopy repository logical drive stores
information about all of the data that changed since the FlashCopy was created.
Tip: You can select a FlashCopy logical drive as the source logical drive for a VolumeCopy. This selection
is a good use of this feature, because it performs complete backups without significant impact to the
storage subsystem availability. Some I/O processing resources are lost to the copy operation.
Important: If you choose the base logical drive of a FlashCopy logical drive as your target logical drive,
you must disable all of the FlashCopy logical drives that are associated with the base logical drive before
you can select it as a target logical drive.
9-9
Chapter 9. Using the VolumeCopy Premium Feature