IBM TotalStorage DS4300 Turbo, Installation, User'S, And Maintenance Manual

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Note: Each DS4300 controller type has a different FRU number, as follows:
DS4300 storage subsystem type Controller FRU part number (P/N)
Single-controller (Model 6LU/6LX) 24P8961
Dual-controller, standard (Model 60U/60X) 24P8059
Dual-controller, Turbo option with 1-GB memory
(Model 60U/60X)
24P8225
Important: Please note the following information.
v The cache battery is not included with the controller FRU.
v Ensure that you replace the failed controller with the appropriate FRU. There are
no protection mechanisms to block out an incorrect FRU from being inserted into
DS4300 controller slots. Unpredictable results can occur when nonmatching
controller FRUs are present in a single DS4300 chassis.
v
After the new controller in a DS4300 single-controller storage subsystem (Model
6LU/6LX) completes the boot process, its WWNN will change. If you have any
applications that rely on the previous WWNNs, such as FC switch zoning
definitions, you must update the applications with the new WWNNs.
For information about the RAID controller cache memory and rechargeable battery,
see “Cache memory and RAID controller battery” on page 101.
Replacing a RAID controller
When instructed to do so by the storage-management software, replace a RAID
controller that has failed.
Important: The replacement RAID controller CRU does not come with a RAID
controller cache battery installed, nor the mounting hardware that holds
the battery in place inside the RAID controller. You must remove the
cache battery that is inside the existing RAID controller that you are
replacing, and install that battery inside the replacement RAID controller
CRU, using the battery unit mounting hardware taken from the existing
controller. The steps to remove and replace the battery are included in
the following procedure.
Battery-access panel (on bottom)
Levers
Ethernet address label
Figure 97. RAID controller levers and labels
Chapter 5. Installing and replacing components
135