Dell PowerVault 221S (SCSI) - Manual (Page 31)

Troubleshooting: Dell PowerVault 220S and 221S Systems Installation and Troubleshooting Guide
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Installing a Split-Bus Module
1. Depending on your mode of operation, adjust the bus configuration switch to the proper position.
Top position for joined-bus mode
Center position for split-bus mode
Bottom position for cluster mode
For more information on these modes, see " Split-Bus Module ."
2. Carefully insert the split-bus module into the empty module slot.
3. Push the module to the back of the slot until it is firmly seated in the backplane connector (see Figure ).
4. Using a #2 Phillips-head screwdriver, tighten the captive screw at the top of the split-bus module to secure the module
to the chassis.
5. If you changed the bus configuration mode after removing the split-bus module, you must reboot the storage system
then the server.
Replacing the Power Supply
Your storage system supports two combined power supply and cooling modules. While the system is designed to operate
normally with only one functional power supply, both cooling modules (with two blowers each) must be present for proper
cooling. If only one power supply is needed, a blank must be inserted into the other slot to mount the second cooling module.
CAUTION: A power supply and cooling module can be removed from a powered-on system for a maximum
period of five minutes. Beyond that time, the system begins to overheat, and at a critical temperature,
shuts down to prevent damage.
The cooling module is securely mounted to the power supply using a hook-and-latch fastening design. This simplifies the
removal and installation of cooling modules and power supplies.
Replacing a Power Supply in Systems With Redundant Power Supplies
NOTICE: If you have a system with two power supplies, the power supplies are hot-pluggable. You can install or