Checking and changing SCSI Initiator IDs<a class="indexterm" name="id427499"></a>


Checking and changing SCSI Initiator IDs
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Checking and changing SCSI Initiator IDs

The SCSI Initiator IDs for the host bus adapters (HBAs) on each of the systems that access the shared storage must be unique. So, you may have to change the HBA SCSI ID on one or more systems if these IDs are the same. Typically, the host bust adapters (HBAs) for the SCSI devices are shipped with a default SCSI ID of 7. Use the following procedure to check SCSI IDs and change them if necessary.

To check and change SCSI initiator IDs

Turn on the power of the first system. During the boot process, the system delays for ten seconds, giving you the opportunity to stop the boot process and enter the boot menu:
```
To discontinue, press any key within 10 seconds.
```
Press any key. The boot process discontinues.
```
Boot terminated.
```
When you see the boot Main Menu, display the Information Menu by entering:
```
Main Menu: enter command or menu > in
```

From the Information Menu, enter "io" at the prompt for I/O interface information:

Information Menu: Enter command > io

The output shows information about the I/O interfaces and resembles:

Path       Bus     Slot    Vendor   Device 
  Description      (dec)      #     #         Id           Id 
  -----------      ----       ---   -----     ------     ------ 
  .
  . 
  SCSI bus cntlr   0/3/0/0   24     10        0x1000     0xf 
  .

Return to the Main Menu:

  Information Menu: Enter command > main

Go the Service Menu:

  Main Menu: enter command or menu > ser

Display the host bus adapter's SCSI ID:

  Service Menu: enter command or menu > scsi

The output displays information about the SCSI devices:

 Path (dec)        Initiator  ID    SCSI Rate    Auto Term 
--------------   ------------       ---------    --------- 
0/3/0/0          7                  Fast         Unknown

The output in this example shows the SCSI ID is 7, the preset default for the HBA as shipped.

If you choose, you can leave the ID set at 7 and return to the Main Menu:
```
    Service Menu: enter command or menu > main
```
You can change the SCSI ID for the HBA. For example, to change the SCSI ID from 7 to 6, you would enter:
```
     Service Menu: Enter command > SCSI init 0/3/0/0 6 
FAST
```

To verity the change, enter "SCSI" at the prompt:

           Service Menu: Enter command > SCSI

         Path (dec)    Initiator ID   SCSI Rate   Auto 

Term   
       --------------   ------------ ---------                                                           ---------   
           0/3/0/0      6             Fast         Unknown

Return to the Main Menu:

    Service Menu: enter command or menu > main

At the Main Menu, enter the command to boot the system. Answer "n" when you are prompted to interact with IPL:
```
 Menu: Enter command or menu > boot
 Interact with IPL (Y, N, or Cancel)?> n

 Booting...
```

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