IBM DS4800 User, Installation And Maintenance Manual page 165

Upgrade preparations requirements
Before you upgrade the controller cache in your existing DS4800 storage
subsystems, perform the following steps:
1. Save the DS4800 storage subsystem profile. Store the profile in a different
location than the disks that are attached to the DS4800 storage subsystem
to be upgraded. Also, save the configuration of the setup, including the
topology and logical drives to logical unit number (LUN) mapping. Refer to
the online help in the Subsystem Management window for instructions on
how to save the subsystem profile and configuration information.
2. Perform a full system backup.
3. Upgrade the DS4000 drive expansion enclosure ESM firmware version of
the existing DS4000 drive expansion enclosures to the latest levels that
are posted on the DS4000 System Storage Disk Support Web site:
www.ibm.com/servers/storage/support/disk/
You must perform the drive expansion enclosure ESM firmware version
upgrade before you upgrade the controller firmware in the following step.
4. Upgrade the DS4000 Storage Manager client host software to DS4000
Storage Manager version 9.16 or later and the DS4800 storage subsystem
controller firmware to version 06.15 or 06.16 or higher.
5. Verify that both of the DS4800 storage subsystem power supply fan units
are plugged in, powered on, and in optimal state. Use the DS4000 Storage
Manager client host software to verify that the DS4800 storage subsystem
is in optimal state. (This step is not required for cold upgrades.)
6. If the DS4800 host ports are connected to a FC switch, use the switch
monitor tool to make sure that the DS4800 host ports and the server FC
HBA ports are operating optimally. No unexpected port log-out and log-in
events should be reported. If there are any, make sure that the cause or
causes of these events are corrected before starting the DS4800 controller
cache upgrade. (This step is not required for cold upgrades.)
7. Verify that the premium feature keys are available. Also, locate all premium
feature and entitlement proofs of purchase and ensure that they can be
accessed when needed.
8. Use the DS4800 Installation, User's, and Maintenance Guide for reference
as needed. This upgrade procedure may refer to specific sections in the
DS4800 Installation, User's, and Maintenance Guide. A hard copy of this
guide was included in the original DS4800 shipment. Additional copies of
this guide in pdf format are available on the DS4000 System Storage Disk
Support Web site:
www.ibm.com/servers/storage/support/disk/
9. If you use out-of-band (direct) management and assign IP addresses to
the DS4800 controllers using Dynamic Host Configuration Protocol (DHCP)
based on the DS4800 controller MAC addresses, you must upgrade your
DHCP server with the new MAC addresses for the replacement DS4800
controllers in the upgrade kit.
Two upgrade methods are possible when you perform the DS4800 controller cache
upgrade:
v Hot-case upgrade procedure — The DS4800 storage subsystem remains
powered on and receives I/Os during the controller cache upgrade. Because the
DS4800 storage server controllers will be swapped during the upgrade, you
Chapter 5. Replacing components
143