A single user regularly runs out of PVS cache disk - UserLayer is engaged

[Alexey Kutuzov1709163409]

Hi All,
Env:
* ELM2306 + CVAD 1912CU8 LTSR + Windows 10 1809 LTSR delivered by PVS
* UserLayer is in place

We found out a strange issue for a single user (always the same) when pvs cache runs out of space. 
Performance analyzer shows system process as major contibutor of write opereations.
Accroding https://support.citrix.com/article/CTX227454 "Although you still need to observe the utilization and adjust, User Layers may significantly limit the additional usage in the PVS Cache Disks"

Any ideas why it happens only for the single user? 
The user's are doing similar things to the other users.

Is there any guidance how to troubleshoot and nail down such issues?

[Jeff Riechers]

Your writecache disk needs to be at least the size of the c drive + user layer size.  it can be thin provisioned.  

 

what size is their user layer compared to other users?

[Rob Zylowski]

So your issue is that the pvs cache runs out of space?

 

You right that is strange as almost al writes after the user layer is attached should be going to the user layer.

 

I think you will need a case for this one.

[Alexey Kutuzov1709163409]

Jeff,

the settings for all users are the same and PVS cache size is enough and never fill more than 3GB for everyone else as far as all writes supposed to be following  into userlayer as Rob mentioned above and in CTX227454.

 

Rob,

Thanks.

Is there any way\tool to understand why this happens  besides Performance analyzer?

[Rob Zylowski]

No determining what's going in the pvs cache id always difficult,   But its pretty weird its only one user but there are a few folders we dont put in the user layer and maybe this user has added something to their user layer that is affecting those folders.

[Jeff Riechers]

Also look at the user's workflow.  If their personal disk is the same size as other users, then the question is what are they doing in that layer to fill the writecache.  If they are loading, manipulating, and unloading files, those changes will stay in that cache until they reboot.