I have referenced Desmond Chan’s blogs in the past, mainly around the configuration of an SRM demo environment, but here is another valuable resource on how to configure a Data Recovery Dedupe Store in vSphere.
The following article is from the VMware VIOPS site and may require a logon to access. If you don’t have one I highly recommend registering as there is a lot of free, valuable information available from this site.
[...] Matt Hensley, I found this VIOPS document on configuring a VMware vCenter Data Recovery dedupe [...]