What is the real world number of occasional users a Session Cal can support. The QV documentation suggest an average of 10 users per Session Cal, I expect that the answer is highly dependent on what the mix is of user profiles for each engagement - but I would appreciate some comments on others experience in just how far we can push a session cal without to great of a risk to the users access. We will support the session cal with usage cals for peak periods. Thanks in advance.
As you've suggested, it's dependent on usage patterns. I'll share my experience. My license is 15 Named User (NU) CALS and 15 Session CALs. Here's the usage data for a typical month (October 2009)
Most (~90%) of the sessions are concentrated bewtween 8-5. Mon-Fri. # of distinct users: 165. 12 of the total were Named Users, the remaining 153 were Session users. # of documents: ~100 # of doc sessions: Session CAL 2398, Named User CAL 1033, total 3431. Peak concurrent Session CAL usage: 12 occurred once during the month, 10 occurred eight times. Peak concurrent Named Users: 6 occurred once during the month, 5 occurred four times.
When a Session User has two documents open, that utilizes two Session CALs. A Named User can open many documents concurrently with the single Named User license. So I optimize my capacity by assigning the NUs to the heaviest users. You can see that by comparing the avg sessions for NUs (1033 / 12) vs the Session users (2398 / 153).
So in my experience, the 10 users per Session CAL suggestion is about right. I think you can get a few more than that with thoughtful distribution of NU licenses. QV9 complicates the NU assignment a bit, because assigning an NU is how you make someone a developer. I not on QV9 yet so I haven't yet tested the impact of that change on license usage.