[Update 11/30/2010 – another great reason to deploy it in a single farm is the ability to integrate Project Server web parts in other location within a farm, see this documentation on TechNet for more info. Plan for Project Server 2010 Web Parts]
Following a number of questions on this topic at Tech.Ed a few weeks ago and this recent post from Joel Oleson: Project Server 2010 and SharePoint 2010 Coexistence please find below my humble opinion on this question: Should Project Server 2010 be deployed in a standalone Farm or should it be deployed in an existing SharePoint Farm?
First lets start with an overview of the two deployment scenarios:
As a reminder please find the version compatibility below (see recent Tech.Ed presentation below); in a nutshell you cannot mix 2007/2010 version of Project Server and SharePoint:
So while mix scenarios are not supported, it is possible to go from 1 to 2 (Together to Apart) or the reverse from 2 to 1 as shown below
So back to the initial question, which scenario to choose (again there are plenty more pros and cons I have put together in these slides listed below), well it depends as listed below, but I would recommend a single farm for the following reasons:
Why Together (#1) in no particular order:
While with the 2007 version most customer deployment I saw was about a 50/50 split between 1 and 2 (I did talk to a few customers that did not realized what they lost from a functional point of view by separating the farms and were looking for non-supported workaround); in 2010 with the tighter integration with SharePoint 2010 (the Business Intelligence/Reporting capabilities used by PWA or the Demand Management/Workflow capabilities to name a few) and the fact that organization want a consolidated infrastructure for Collaboration (whether its document management, performance management or project management) I would strongly recommend option 1. To follow up on Joel’s arguments (yes this is a constructive argument and Joel and I know one another!):
So again think of the functional, technical, maintenance, licensing implication of deploying Project Server and SharePoint Server together or apart, thanks to Joel for starting the debate , in the end the great news whether you decide to go with 1 or 2 is that you can always reverse the decision as mentioned before. As with all my post feel free to send feedback and share your opinion. Happy Project Server 2010 and SharePoint 2010 deployment!
Resources on this subject: