Note: Avoid operating the DS4100 with controllers of different cache sizes.
Operating the storage server with controllers of different cache size will
disable caching and might adversely affect performance. Always verify that
you replace a failed controller with a controller that has the same FRU part
number.
To replace a RAID controller, perform the following steps:
1. DS4100 single-controller storage server only:
The DS4100 single-controller storage server has only one RAID controller. If
you are replacing a failed RAID controller in the DS4100 single-controller
storage server, you do not need to power down the DS4100 before replacing
the RAID controller.
If you are replacing a functioning (non-failed) RAID controller in the DS4100
single-controller storage server, do not remove or replace the RAID controller
in the DS4100 single-controller storage server without first stopping the host
applications, unmounting the logical drives from the host server, and powering
down the storage subsystem.
2. Check the DS4000 Storage Manager client for instructions on RAID controller
failure-recovery procedures. Follow the steps provided in the software
documentation before continuing with the following step.
3. Label each cable that connects to the RAID controller that has failed. This
ensures that all cables will be properly reconnected to the new RAID controller.
Attention: Handle and install fiber-optic cables properly to avoid degraded
performance or loss of communications with devices. When working with
fiber-optic cables, do not pinch them, step on them, or locate them in aisles or
walkways. Do not overtighten the cable straps or bend the cables to a radius
smaller than 38 mm (1.5 in.).
4. From the RAID controller that has failed, remove the fibre-channel cables from
the SFPs. The location of these components is shown in Figure 71.
After removing the fibre-channel cables, insert the protective caps.
5. Use the following procedure to remove the SFPs from the RAID controller that
has failed.
a. Remove the LC-LC fibre-channel cable from the SFP module. For more
information, see “Handling fiber-optic cables” on page 45.
SFP module
RAID controller
Fiber-optic
cable
f10ug041
Figure 71. Location of SFPs and fiber-optic cables
Chapter 5. Installing and replacing components 97