A quick word on what circumstances pureScale is best suited to.
First to say what it is not not suited to i.e. data warehouse type applications. It is a shared disk solution and as such not really suitable for data warehousing. This is because of tendency of large transactions being the main workload in such an environment.
It is suited to OLTP loads.
Do you need to come up with a database solution for your application? This could be a new build or replacing old hardware and software.
Do you have an application that generates a lot of small of smallish transactions?
Do you need continuous availability and built in resilience?
Do you need to be able to ramp up the capacity of your system easily in the future rather than buying all of the hardware and licenses you might need over the next 2 - 5 years now?
If the answer if yes to most of these questions then pureScale is for you.