XenServer storage performance can be monitored with a command line tool called xsiostat. Increasing the amount of data that can be in transit between the virtual machine and the storage repository at any given time will improve performance.
The SDx Platform from Sanbolic, whose Melio software has helped organizations worldwide realize the greatest value from their Citrix VDI deployments for many years, is a pure software-based SDS solution that allows customers to create their own (customized) storage systems using industry standard computing and storage components. Such systems, whose intelligence is delivered through the platform's advanced software stack, offer superior performance and scale-out capabilities (thousands of nodes and exabytes of storage capacity), as well as unparalleled resilience, at significantly lower cost than traditional hardware-based storage arrays.