Currently we are upgrading our SharePoint 2010 Farm to SP2, the farm topology consists of 5 application and search servers and 20 Web Application servers which support 6 heavy utilized portals.
after installing the service packs on all servers, I've initiated the upgrade software on the first application server but the upgrade failed and when I checked the error log file I found that all the errors were related to missing portal solutions on the application server, so I started the upgrade on one of the web servers and it ran successfully. the question now is, do I have to install all the solutions on the application servers as well to have a successful upgrade or no need to do that?
Thanks,
