You can check the size of the image
Cat6509-E# dir disk0:
Cat6509-E# dir /all
sho boot variables
Cat6509-E# show bootvar
reboot switch
Cat6509-E# reload
to see module status
Cat-6509#show module
Check redundancy
Cat-6509#show redundancy
Verify that the Cisco IOS image (s3223*) required for the upgrade is on either Supervisor Engine bootflash
sup-bootdisk: and slavesup-bootdisk
Configure the boot statement to boot the new image and save the configuration.
boot system disk0:s3223-ipbasek9-mz.122-18.SXF.bin
reset standby supervisor
Cat-6509#hw-module module 6 reset
Manually switchover to the standby Supervisor Engine in slot 6.
Cat-6509#redundancy force-switchover
Enable stateful switchover
Router(config)# redundancy
Router(config-red)# mode sso
Router(config-red)# end
Router# show redundancy states