IBM 88861TU Planning Manual page 47

Note: Pass-thru modules are not supported in I/O module bay 1 if you install SAS
RAID controller modules in I/O module bays 3 and 4.
For a complete list of supported Ethernet switch modules and pass-thru modules,
see the IBM ServerProven Web site at http://www.ibm.com/servers/eserver/
serverproven/compat/us/eserver.html and select BladeCenter S (8886,7779).
I/O module bay 2 configuration options:
I/O module bay 2 supports an optional I/O module, such as an Ethernet switch or
pass-thru module, that connects to the Ethernet controllers on the Ethernet
expansion card option in each of the blade servers.
Note: If you install an I/O module in I/O module bay 2, you will also need to
install an expansion card option, such as the 2/4 Port Ethernet Expansion Card, in
each blade server that will access the external Ethernet network through the switch
module in I/O module bay 2.
You must use a filler in the bay if no I/O module is installed.
I/O module bays 3 and 4 configuration options:
I/O module bays 3 and 4 are connected to each blade server bay and both storage
module bays in the BladeCenter S chassis.
The two bays also support Ethernet switch modules, Fibre channel switch modules
or pass-thru modules (optical and copper) if the storage modules are not being
used.
Important: I/O module bays 3 and 4 must both contain the same type of switch
(either SAS modules, Ethernet switch modules, pass-thru modules, or
Fibre-channel switches).
SAS connectivity modules
If you are implementing a single SAS connectivity module, install it in I/O module
bay 3.
Important: In addition to installing SAS connectivity modules, you must also
install a SAS expansion card option in each blade server that will access the
integrated shared storage.
See "Planning for SAS connectivity module zoning" on page 54 for more
information about configuring the integrated shared storage when using SAS
connectivity modules.
SAS RAID controller modules
If you are implementing a RAID storage solution you must install two SAS RAID
controller modules, one in I/O module bay 3 and the other in I/O module bay 4.
In addition, you must install the two battery backup units, which provide backup
for the SAS RAID controller modules cache.
Important: You must also install a SAS expansion card option in each blade server
that will access the integrated shared storage.
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Chapter 3. Planning for deployment