World of EUC

currently 2048 and yes HDX Insight is in use for ADM

Not sure what's the situation today, but at some point having over 1000 CCU with HDX insight on virtual wasn't possible

Found this blog regarding HDX sessions. <https://www.citrix.com/blogs/2020/03/31/lessons-from-the-field-scaling-citrix-gateway-for-business-continuity/>

_"Similarly, our virtual ADC VPX appliances are limited by the underlying hypervisor or cloud platform and have a maximum limit of 9,000 concurrent HDX connections to a single appliance."_

Ofc it's just not 4500CCU, different game if you have that amount of 3D CAD users or some static ERP or similar

sure that's true. In this case regular task workers without 3D

so not too much bandwidth, but I'd still assume you need a pretty big VPX to cater that amount of sessions

<https://www.netscaler.com/content/dam/netscaler/documents/data-sheet/netscaler-software-form-factors-data-sheet.pdf>

For the MPX you get the amount of supported ICA sessions

With that user amount I would probably build up a GSLB setup where I would distribute the load to several boxes rather than running one HA pair. Losing one box wouldn't drop all the sessions and the HDX insight might work better. However, I have no actual experience on running that amount of sessions other than on the hardware boxes

Do you have a take on this <@UN1U1R69M>? (4500 CCU, HDX Insight enabled on VPX)

Take a look at <https://docs.citrix.com/en-us/tech-zone/design/design-decisions/cvad-bandwidth-estimate.html> to get some estimates on the throughput, but regular task workers with some browsing would still be around 2250Kbps, so you're looking at a VPX3000 at least, maybe even higher.
You might just be in the ballpark where a smaller MPX would be a wiser choice, since you control the hardware, whereas a hypervisor can have a lot of other stuff running that can affect your performance.

Also keep in mind amount of the packet engines that a VPX can have is tied into the license, take a look here <https://support.citrix.com/article/CTX139485/memory-and-vcpu-requirements-for-citrix-adc-netscaler-vpx>

Thank you Mads! Yes we thought about a even higher edition like VPX5000. Do you know a customer which uses VPX in a similar scenario? I guess you're right regarding MPX. Another plan was to add two appliances (HA) in each of the two datacenters. ... this would be the safest choice I guess.

Remember if you’re going to do GSLB there is a lot of considerations on the cvad side about how to handle user profiles, printers and such.

My biggest issue with VPX on a larger scale, is the hyper visor is out of my control almost always, so I can’t control the resource or overcommit, which could lead to a degradation in performance for the appliance I own.

You should definitely have HA for that amount of users.