I have to upgrade 3750 Stack switch ( Stack of 7 Switches ) , switches are on Remote Site , i have done it locally but since Switches are on remote site and once i will reboot the Switches i will be disconnect by the time Switches come up successfully .
any suggestion to perform this activity ………………
Seven switches, that is a lot of access switchports to leave swinging in the breeze! :)
My only recommendation would be to use the universal TAR file. Verify the MD5 hash and use the archive download-sw command to ensure it is installed on each switch correctly.
Keep i mind that if you are jumping from 12.x to 15.x there will be numerous microcode upgrades to complete during bootup. It will take anywhere from 30 to 45 minutes to complete.