in the documentation is following method:
1/set system highavailability disable
2/copy slot0:cat6000-sup2k8.7-2-2.bin bootflash:cat6000-sup2k8.7-2-2.bin
4/clear boot system all
5/set boot system flash bootflash:cat6000-sup2k8.7-2-2.bin
and the following sentence:"In approximately 120 seconds, the image set as the boot entry on the active supervisor engine will be copied to the bootflash on the
standby supervisor engine (this is the image synchronization)". Is it possible without highavailability enable??? I don't know if I have to run highavailability before point 5.
When you just copy the image to the active sup engine it will not let the active sup know that it has to copy the image to the standby but as soon as you set the boot variable on the active supervisor engine to the new Catalyst OS software image it triggers the request to the active sup to copy the image to the standby.
In most cases it will work this way only but sometimes I have seen it does not happen so at that time reseat the standby sup and it will request for any new image from active sup engine and will start copy to stany sup internally via tftp.
High Availibity is not concern in copying the image to standby at all. The High Availability software feature of Catalyst OS further enhances the Cisco Catalyst 6500 Series hardware redundancy by also providing protocol redundancy. This feature includes two main functions: stateful protocol redundancy and image versioning.
HTH, if yes please rate all post.