- IBM switch Users and Maintenance Guide

inserted into DS4100 controller slots. Unpredictable results can occur when
nonmatching controller CRUs are present in the same DS4100 chassis.
v After the new controller in a DS4100 single-controller storage server completes
the boot process, its WWNN will change. If you have any applications that rely
on the previous WWNNs, such as fibre channel switch zoning definitions, you
must update the applications with the new WWNNs.
v All factory-delivered DS4100 RAID controllers are shipped with a recent version
of controller firmware loaded on the RAID controller, but that firmware version
might not match precisely the firmware version of the failed RAID controller you
have replaced. When you replace one of the RAID controllers in the DS4100
base storage server, the newly replaced controller will automatically be updated
with the controller firmware version of the existing controller in the DS4100
chassis.
However, when you replace the RAID controller in the DS4100 single-controller
storage server, if the firmware version of the replacement RAID controller is
determined to be incompatible with the configuration database during the boot
process, the DS4100 single-controller storage server will enter a Stop State and
will not allow any DS4000 Storage Manager operations to be performed. In this
case, you must manually upgrade or downgrade the replacement RAID controller
firmware to match the version required by the configuration database. See
“Manually upgrading the firmware for the DS4100 single-controller storage
server” on page 103.
v DS4100 single-controller storage server only: Do not use the RAID controller
replacement procedure in this section to upgrade a DS4100 single-controller
storage server to a DS4100 base storage server. Currently there is no support for
upgrading a DS4100 single-controller storage server. When such support is
available in the future, the DS4100 single-controller storage server upgrade kit
and the revised edition of this document will provide the upgrade instructions.
In a DS4100 base storage server, you can hot swap one controller while the other
is still active. The figures in this procedure show the base storage server. If your
storage server is the single-controller storage server, controller slot B will have a
blank controller rather than the second controller as shown in these figures.
For information about the RAID controller cache memory and rechargeable battery,
see “Cache memory and RAID controller battery” on page 75.
Battery-access panel (on bottom)
Levers
Ethernet address label
f10ug034
Figure 70. RAID controller levers and labels
Chapter 5. Installing and replacing components 95