3. Install the IBM BladeCenter SAS Connectivity Modules in the I/O bays in BladeCenter unit. See the
documentation that comes with the SAS connectivity modules for installation requirements and
procedures.
4. Go to “Connecting BladeCenter hosts to the DCS3700.”
Connecting BladeCenter hosts to the DCS3700
The dual-controller DCS3700 comes with two SAS host connectors on each controller, enabling up to 28
blade servers in two BladeCenter units to be redundantly connected to the storage subsystem.
To protect against the loss of any one path from the host blade servers to the DCS3700, use redundant
host connections.
To connect a SAS expansion card that is installed in a blade server to the DCS3700, complete the
following steps:
1. Connect a SAS cable from the SAS host connector on the DCS3700 storage system to any SAS port on
an IBM BladeCenter SAS Connectivity Module that is installed in a BladeCenter unit (port 3 is
recommended).
2. To create a redundant host connection, connect a SAS cable from a second SAS connectivity module to
a host connector on the other controller in the DCS3700. You can only create a maximum of two
redundant host connections in a dual-controller DCS3700, one connection each from the blade center
to the DCS3700 controller host port as shown in Figure 40.
Attention:: You can connect only one DCS3700 to the BladeCenter SAS Connectivity Module. No other
external devices can be connected to the SAS connectivity module.
Connecting Fibre Channel hosts to the DCS3700
Using Fibre Channel switches, up to 128 hosts can be redundantly attached to the DCS3700 storage
subsystem in a Fibre Channel storage area network (SAN) fabric.
Figure 40. Example of DCS3700 connected to a single BladeCenter unit
60 IBM System Storage DCS3700: Installation, User, and Maintenance Guide
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