HP EVAs are mid range arrays. EVAs I’ve worked on are EVA5000/EVA6000/EVA8000/EVA8100/EVA8400.

Typical hardware configuration consists of 2 controllers and a number of disk enclosures, each connected to both contollers. Different EVA models have different cable connections. Also, different disk enclosures can take disks of different form factors. Check out links mentioned below for further information.