Recently I have had the pleasure to use PernixData but I did come across a bit of a ‘gotcha’ after uninstalling it from my hosts. If like me you use iSCSI then you will likely spend a bit of time setting up your Path Selection Polices to suit your specific needs, so it was interesting to note the following. When you do uninstall and remove PernixData from your hosts your Path Selection Polices do not revert back to your original configuration rather they revert back to the default vSphere setting of MRU (Most recently used).
Just a quick script to set the Path Selection Policy on any LUNs on a host that do not have your target policy enabled. The script sets the server to Maintenance mode first, evacuating any VMs if you are in a full DRS automated environment. While this is not strictly necessary, it was required for my production environment just to be safe. param( [string] $vCenterServer = $(Read-Host -prompt "Enter vCenter Server Name"