PVS write cache full issue crashing your VDI’s? check following if using Outlook

Seen this issue cause some pain recent enough.


XenApp 6.5 HRP05

Published Desktop running W2008 r2 and Office 2013 using PVS 7.9 golden images

Received reports of users getting hung sessions. On reviewing system see it can’t be RDP’ed too, completely froze. Issue caused by write cache spilling over from RAM onto hard drive and filling hard disk.

Root cause

What caused the write cache to blow up was chiefly offline address books being downloaded every time the user logged into outlook. As our environment is quite large these are in around the 500mb size range. With these systems being rebooted once a week and often times 10 logons on a system in a given day quickly noticed write cache growth across the board by Wednesday’s precipating reboots.

In order to fix we needed to disable download of the Offline address book when users’ accessed Outlook. We run in a cached mode in Exchange but was fine to disable the need to download.

Key is to add the registry hack in


and we were good to go

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