At least at the enterprise, cost is no object level, why isn't this architecture pretty much universal? Cost? Inertia?
->Great question. I think there are two reasons. First each vendor has different technology and they have invested a lot of money in their technology. To throw away years of research to fundamentally change their technology does not make sense. AULA arrays sell well to customers as a lower cost choice to active/active. They are stuck supporting legacy technologies. In a lot of cases their who technology is based around a active/passive option which means none of their speed algorithms will work with a/a.
For enterprise why are they not all useing a/a that depends on requirements. Sometime a/p is good enough perfomance. Mostly it's cost. 1PB of AULA is simply cheaper than 1PB of A/A. This is due to the hardware and cache cost.
Personally I love to use A/A array's and I am seeing them take over everywhere except solid state. Almost every solid state array I have seen is AULA if Fiber channel. SSD brings a whole new technology game.
Let me know if you have additional questions.
Thanks,
J