In part 1, and in the comments, we briefly touched on some of the advanced bits of the XenDesktop licensing. Here’s some more detailed info:
Licenses are assigned for a 90-day period, as defined by “LP=90” in the license file. This means licenses are released after 90 consecutive days of inactivity. NOTE: If you have multiple farms and want license sharing, all farms must point to the same license server. There is no communication between license servers! As mentioned by 3 in the comments of part 1, you can release licenses prior to the 90-day timeout. To release licenses prior to the 90 days, use the command-line utility UDADMIN.exe. This is located in \Program Files (x86)\Citrix\Licensing\LS, and you MUST run it locally on the license server. More info, including switches and syntax: http://support.citrix.com/proddocs/topic/licensing-119/lic-admin-cmds-list-deletes-user-device-r.html
There is a 30-day free trial option (requires license server 11.9 or higher). If, after 30 days, you decide you like it, all you need to do is purchase and download a license file to move the evaluation version into production.
For you PowerShell nerds, there are also some PowerShell cmdlets available for v11.9 and 11.10:
Still haven’t gotten enough of XD licensing? Every question you could possibly think of has most likely already been addressed here: http://support.citrix.com/article/CTX128013 Take a look if you are having trouble sleeping. Me? I’m not. I just passed XenServer 5.6 today, and I’m beat.
Sure, everybody knows about the 2-for-1 trade up that Citrix is offering to get into XenDesktop from XenApp, right? Of course. But – it switches you from Concurrent licensing to User, right? Well, sort of. I recently went through some Citrix training, and XD licensing now works like this:
User mode is now called User/Device mode. That’s right. Device licensing. What’s better? The Citrix license service automatically switches back and forth between User and Device on a per license basis to ensure you are consuming the fewest possible licenses. That’s right, Citrix is trying to save you money! It works like this:
User A logs in from a PC. User A consumes a User license.
Shift change. User B logs in from the same PC. The license server says “Oh, I can use a device license here”. Boom. Two users, one device. Then, User A logs in from an iPad. User A is now consuming a user license, and ANYONE who logs in from that same PC will only consume a device license. This is GREAT news for any companies that run multiple shifts of users on the same devices, provided they don’t go home and connect from an iPad or an iPhone or whatever.
But – there’s another cool feature. With XenDesktop, you also get a 10% “overdraft” on your licenses. So, you have 500 seats of XenApp. You do the 2-for-1 trade up deal and get 1000 User/Device licenses of XenDesktop. THEN, you get a free 10% overdraft, meaning you can actually consume 1100 licenses. So, you effectively more than doubled the number of concurrent connections you are licensed for (provided, of course, that they all come from the same 1100 PCs). The penalty for overdraft? NOTHING. NADA. ZIP. How long can you overdraft for? YES. That’s right, perpetual.