8/15/2013 7:18:33 AM
RE:Upgrade from 5.5R2 to 6.0 with webfarm and content staging
1. and 2. - the data will persist.
3. You can upgrade both web projects separately or, if they are exact same copies, upgrade one and then just copy it to the second server. The DB is the same, so you will run the SQL script only once.
4. Be sure you have most recent backups, you have read and understand the upgrade instructions, you have list of all your customizations so you will know what to do - there were several API changes so you may need to change the custom code manually. Also, make sure that the staging and production sites are off-line during upgrade and also that there are no changes made e.g. on production while staging is off-line.