Hello, using CPM 2507 on W25. 1. I enabled the caching for container, at logon it seems to copy the files locally based on the log. Main reason for me is too keep the profile IOPS on the worker' SSD. That's how it works right? 2. I am aiming for a small VHDX, about the size of my current file based UPM, 100MB ish, I can go higher if really needs be. Reason for the container is to speed up logon and log off but on point 1. because local copy, I had a 40sec for tbe copy but profile was 1GB, so no let a great test. Question is anyone doing this ? I know a lot here use container and they don't care about the space but I think we can have a sweet spot here especially with UPM and that's what I am looking for. I don't see a need for a 10GB profile tbh. 3. Last we use FSL for ost, I wonder if I should have all in one container but at the same time, FSL in its own share is handy so you can use different storage and backup policy. What are you doing? Thanks!

1. You can certainly do that and cache it. That keeps all IO local except for the cache and the write back. You could also set it up with differencing disks. There is read i/o, but write i/o stayts on the diff disk. 2. 100MB isn't realistic for a container-based solution. Yes, the local copy will take longer as it's potentially bigger, but profile streaming helps with this. If you're still struggling, you can do a hybrid solution. File-based mixed with containers. Honestly though, one of the big benefits of containers is WAY less mounts/transactions. You might be surprised by keeping the container on the network and just mounting it. 3. For FSL, we do have our office containers separated from the profiles. That way we can make sure we're backing up data that ISN'T in the cloud. This was also recommended when we implemented. If we go FSL for WS25, we will definitely re-evaluate as it is NOT recommended any more. For CPM, we do separate the OneDrive Container and the Outlook container. Again, opportunities to separate data that needs to be backed up from data that is already "in the cloud."

Great insights @keislij thanks a mill for your answer! I agree the hybrid file/container is not appealing, I'll lose the advantage of the mount vs thousand of files copy (network is a killer DEFO, I expect perf to be much better with container, main reason of going to it is I hope to speed up logon/log off) and for what benefits? Nothing, no? I'm planning to use the diff disks, it solves the one desktop lock session, it's great. I don't think with UPM we can have a different location per type (OneDrive, Outlook), no? That's the main reason of using FSL. Thanks again for that.

UPM lets you specify custom locations for OneDrive and Outlook: Configure VHD settings | Profile Management 2507

Thanks! Sorry I miss your reply. I'll give it a try. So far I can't really find the sweet spot with the container conf.