I have a Server 2012R2 image setup for Elastic Layering. The layering works ok, but if I enable User Profile Disks, I can only place them on a standard SMB share. If I put them on my Scale-out File Server, the UPDs are mounted and created, but the OS fails to write to the profile and doesn't unmount them on logout. I have to power off the server VM in order for the lock to be released. I use the same SoFS for a Win10 VDI NP managed pool with UPDs, and it works just fine. I can't find any report issues with Server 2012R2 and SoFS with UPD -- in fact, that is Microsoft's recommended method for UPD HA.
I'm running Unidesk 4.0.8 with matching client tools version, in a Hyper-V environment. I've rebuilt the image from scratch multiple times, with nothing layered in the image. I can reproduce it reliably. UPD on single SMB = works ok. UPD on SoFS = locked, no data written, no matter how the share is configured (CA on or off). UPD + Win10 + SoFS = works ok.
Server 2012 has no issues by itself storing UPDs on SoFS, and neither do my VDI pools. Is this configuration not supported?