45xx Modular Disk Subsystem Manual for G-Series Releases

Installing and Removing CRUs
45xx Modular Disk Subsystem Manual for G-Series Releases—142466
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Preparing to Replace a BEB
Preparing to Replace a BEB
To prepare for BEB replacement, use SCF to bring down the paths to the disk drives
controlled by the BEB you are replacing. You need to:
1. Determine which paths uses the BEB you are replacing.
2. Use the SCF INFO ADAPTER command to verify which paths the SACs are using.
If there is only one BEB in the module, use the SCF STOPOPENS command to stop
access to all disk drives in this module, while you replace the BEB.
3. Use the SCF STOP command to bring down the drive path controlled by the BEB
you are replacing, and then use the SCF STATUS command to verify that the path is
in the stopped state.
Removing a BEB
To remove a BEB, follow this procedure (see Figure 4-5):
1. Remove the fan CRU as described in Replacing a Fan CRU
on page 4-7.
2. Disconnect the fiber-optic cable connector from its receptacle in the BEB.
3. Unlock the BEB ejectors, if necessary, and then press the ejector release buttons and
swing the ejectors out.
4. Pull on the ejectors to disconnect the BEB and pull the BEB all the way out of the
module.
Note. If you are replacing a BEB in a 455DS disk module, you must first stop all applications
that are using the disk drives in that module.
Caution. Do not remove the fan CRU from a powered module for more than 10 minutes.
Without the fan CRU to circulate air past the components, the module will overheat.