Configuration Behavior After An Upgrade And Storage Subsystem Replacement - IBM System Storage DCS Series Installation And Migration Manual

Configuration behavior after an upgrade and storage
subsystem replacement
The following notes describe the identifier and premium feature behavior after an
upgrade and storage subsystem replacement:
v Worldwide name (WWN):
v Controller IP addresses:
v Storage array identifier (SAI or SA identifier):
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IBM System Storage DCS Series with Gen2 controllers Hard Disk Drive and Storage Enclosure Installation and Migration
Guide
The worldwide names that the original storage subsystem uses before the
upgrade are not returned when the upgrade is complete. Instead, the new
storage subsystem is identified by WWNs that are based on a new embedded
unique identifier.
See your application documentation, device-driver user guide, or related
documentation for detailed instructions for updating the WWN of the storage
subsystem in the application or device driver. Additionally, to review the readme
file and the related IBM System Storage DS Storage Manager Installation and
Support Guide for information about any preparation tasks or
operating-system-specific restrictions, go to http://www.ibm.com/systems/
support/storage/disk/.
When the storage subsystem controllers are assigned static IP addresses, the IP
addresses are stored in the controller NVSRAM and in the DACstore on the
hard disk drives. If the replacement storage subsystem controllers are assigned
the same IP addresses as the original storage subsystem controllers, the two
devices have duplicate IP address in the Ethernet network, if the original storage
subsystem controller is deployed. Best practice is to assign new unique IP
addresses to replacement storage subsystem controllers.
The storage array identifier, or SA identifier, is the identifier that the DS Storage
Manager host software (SMclient) uses to uniquely identify managed storage
subsystems. The new storage subsystem continues to use the SA identifier of the
original DS4000 storage subsystem. This ID is displayed in the storage
subsystem profile as the storage subsystem worldwide identifier (ID). See
Table 10 on page 45.