Datasheet

Chapter 9. IBM Flex System V7000 Storage Node Copy Services 381
Draft Document for Review January 29, 2013 12:52 pm 8068ch09-Copy Servies.fm
Introduction to layers
Version 6.4.1 uses a concept called layers for the IBM Flex System V7000 Storage Node. The
setting for the
layers determine how the IBM Flex System V7000 Storage Node interacts with
the other IBM Flex System V7000 Storage Node, IBM Storwize V7000 or IBM SAN Volume
Controller. Currently there are two layers: replication and storage.
The
replication layer is used when you want to use the IBM Flex System V7000 Storage
Node with one or more other IBM Flex System V7000 Storage Node, IBM Storwize V7000
and a SAN Volume Controller is also a Remote Copy partner. The
storage layer is the default
mode of operation for the IBM Flex System V7000 Storage Node and IBM Storwize V7000,
and is used when you want to only remote copy from the IBM Flex System V7000 Storage
Node to another IBM Flex System V7000 Storage Node or an IBM Storwize V7000. It is also
used when presenting storage to the IBM Flex System V7000 Storage Node from an IBM
Storwize V7000 as external storage for it to manage.
The layer for the IBM Flex System V7000 Storage Node can be switched by running svctask
chsystem -layer replication. Generally, switch the layer while your IBM Flex System V7000
Storage Node is not in production. This situation prevents potential disruptions, as layer
changes are not I/O tolerant.
Figure 9-55 shows the effect of layers on IBM Flex System V7000 Storage Node, IBM
Storwize V7000 and SAN Volume Controller partnerships.
Figure 9-55 The relationship of layers and SAN Volume Controller and Storwize V7000 partnerships
The replication layer allows an IBM Flex System V7000 Storage Node to be Remote Copy
partners with a SAN Volume Controller. The
storage layer allows an IBM Storwize V7000 to
Remote Copy to an IBM Flex System V7000 Storage Node which is also configured to
storage layer, or to function as external back-end storage for an IBM Flex System V7000
Storage Node which is configured to
replication layer. An IBM Flex System V7000 Storage
Node cannot be in both layers at the same time.
Note: Other IBM or 3rd party storage devices licensed and virtualized behind the IBM SVC
may be included in the copy services.