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 DS3500.”
Connecting BladeCenter hosts to the DS3500
The dual-controller DS3500 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
DS3500, use redundant host connections.
To connect a SAS expansion card that is installed in a blade server to the DS3500,
complete the following steps:
1. Connect a SAS cable from the SAS host connector on the DS3500 storage
controller to any SAS port on an IBM BladeCenter SAS Connectivity Module,
which 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 DS3500.
You can create a maximum of two redundant host connections in a
dual-controller DS3500, one connection each from the blade center to the
DS3500 controller host port as shown in Figure 72 on page 77.
Attention: You can connect only one DS3500 to the BladeCenter SAS
Connectivity Module. No other external devices can be connected to the SAS
connectivity module.
3. (Optional) For additional storage, connect EXP3500 storage enclosures to the
DS3500. See the illustration to configure storage enclosures inFigure 38 on page
50.
Figure 72 on page 77 shows an example of a DS3500 that is connected to one
BladeCenter unit.
76 IBM System Storage DS3500 and EXP3500 Storage Subsystem: Installation, User's, and Maintenance Guide
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