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Chapter 4. Upgrading a storage subsystem controller
This chapter describes the procedure to replace the storage subsystem controller in
a working configuration with a new storage subsystem controller of the same or
different model. All the hard disk drives and storage enclosures in the original
configuration are part of the new configuration. Use the procedures in this chapter
only if no drives are attached to the new storage subsystem. This procedure is also
referred to as controller head-swapping. If the new storage subsystem is part of a
working configuration where the storage subsystem controllers are booted with at
least two drives, see Chapter 3, "Adding or migrating storage enclosures," on page
25 to migrate the drives and storage enclosures instead.
IBM support is available for controller upgrade assistance, but you must contact
your IBM marketing representative or authorized reseller as first-line support. For
more information, see "Getting information, help, and service," on page 57.
Only the replacement of the controller in a single working storage subsystem
configuration with another controller is supported. To consolidate the storage
enclosures behind multiple controllers in multiple working storage subsystem
configurations, perform the applicable controller swap procedure that is described
in this chapter to upgrade one working storage subsystem configuration. Then, see
Chapter 3, "Adding or migrating storage enclosures," on page 25 for instructions
for migrating the storage enclosures in the other storage subsystems into the new
controller storage subsystem configuration.
A readme file is available with the latest information and instructions for each
storage subsystem. To access the most recent readme file, see "Finding Storage
Manager software, controller firmware, and readme files" on page 57.
Upgrade considerations
Consider the following information before you upgrade a storage subsystem.
Host attachment and premium feature entitlements
The following notes describe information about host attachment and premium
feature entitlements that you must consider before you upgrade a storage
subsystem.
v To enable premium features in a new or replacement configuration that were
v After the upgrade, premium features that were previously enabled in the
© Copyright IBM Corp. 2008, 2015
enabled in an original configuration, you must purchase the applicable
entitlements for the new or replacement storage subsystem, if that premium
feature is not standard in the new or replacement storage subsystem. In
addition, IBM assigns host attachment kits only to specific storage subsystems.
You must also purchase the applicable host attachment kits for new or
replacement storage subsystems.
original storage subsystem along with the enable-by-default premium features in
the new storage subsystem are automatically placed in Out of Compliance state.
You must generate new premium feature SAFE keys to re-enable premium
features.
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