install a redundant supervisor 720-3B

I am planning to install a 2nd redundant supervisor to 4 of my Catalyst 6509s IOS. After researching via the Cisco web site on the redundant supervisor, I got more confused. I guess it is because I am new to the 6509. Can the experts provide some guidance?
These are the steps that I plan to go through:
- plug the redundant sup in the chassis
- console to the main sup and copy the image to the redundant sup
- initiate the mode SSO command from the main sup

But now I got confused with native IOS, disk0, sleavedisk0, and bootvar. It looks like there are other elements that I need to take into consideration. It does not look like Cisco has a tutorial on how to install a redundant supervisor. Thank you in advance for any help.
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leblancAccountingAsked:
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Don JohnstonInstructorCommented:
This will get you where you need to go.  Just ignore any references to old supervisor.

1)  Remove the failing supervisor (which should not be the current active)

2)  Plug your laptop into the console port of the replacement supervisor and get your terminal program working

3)  Insert the replacement supervisor into the chassis, firmly seating the supervisor into the chassis.

4)  Watch the supervisor come up, making sure that it boots properly and doesn't get stuck in <rommon>

5)  Log in to the current active supervisor

6)  command: show redundancy
            You're looking to see that the new supervisor is listed as <Standby> or <Standby Cold>

7) If the above is true continue to step 8, if the state is <Other> or <Unknown> please check to make sure the new supervisor isn't in rommon

8) command: copy bootflash:s72033-advipservicesk9_wan-mz.122-33.SXI2a.bin

            slavebootflash:s72033-advipservicesk9_wan-mz.122-33.SXI2a.bin

9) command: dir slavebootflash:

            Confirm that the IOS is now on the slavebootflash:

10)command: verify slavebootflash:s72033-advipservicesk9_wan-mz.122-33.SXI2a.bin

            Confirm the CRC is correct

11)command: hw-module module <x> reset    

            The value <x> is the slot number of the module that was replaced. If you enter this incorrectly you may reload the entire chassis, use with caution

12)Wait for the standby supervisor to fully load

13)command: show redundancy                

            Should show the state of the standby supervisor as "Standby Hot"

14)Now you're done.
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leblancAccountingAuthor Commented:
Thanks Don. It looks so simple when you list all the steps. in step5, you meant console into the main sup. Correct?

What if the redundancy sup is in rommon?

I verified my bootvar from the main sup and it shows nothing (see below). What does it mean?
6509-main-bldg#sh bootvar
BOOT variable =
CONFIG_FILE variable =
BOOTLDR variable =
Configuration register is 0x2102

Standby not ready to show bootvar
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Don JohnstonInstructorCommented:
in step5, you meant console into the main sup. Correct?
Yes. Although you could Telnet/SSH.  But a console connection is how I always do it.
What if the redundancy sup is in rommon?
Look at Method 1, step 7.
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