-Consider replicated MV. It will allow you implementing failover systems, among others.
-Take a look at Virtual SAN as storage system, as it is one of the best ones for vSphere and it gets better with every update.
-Keep a copy of vCenter Converter handy. It is very useful to move VMs when other tools don’t work.
-Check what VMs take the most IOPs. It is a good idea to have a tool which performs this task, as VMs behaviours change.
UDS Enterprise is vSphere Ready certified and it enables the deployment and management of virtual and physical desktops, applications and other Windows & Linux services with VMware’s hypervisor.
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Source: Virtualization Review