Issues with Installation of SharePoint 2010 SP1

I recently had a situation where we were installing SharePoint 2010 SP1 update in our SharePoint Farm.  The installation began fine and we were able to install on the first server with no issues.  When we began the update on the second and third servers in the farm when all seemed well.  However executing a few PowerShell commands yielded a message telling us that SharePoint Service Pack 1 was missing.  We tried to re-install the update to no avail, in fact getting a message that the update was already installed.  After filtering through some emails I notice that there have been others in this position and the recommended  solution worked for us.  This solution was to run “Get-SPProduct –local” on the server.  This PowerShell command kicks off the Product Version Timer Job which will update the information causing the initial problem and in effect let’s SharePoint know the current version.

HTH