I am working with 3PAR for the past 2 years, we have T400, V serires and the latest 7400 with 4 controllers,
The main highlight of 3PAR is
- very simple to manage, lun provision, exposure etc.
- it is TRUE Active/Active array (symmetirc active/active)
- the 7400 has SAS HDD support, so use 300 GB SAS 15K disks, to have more spindle
- Check with the vendor for the maximum throughput support for each controller, then caculate your iops and application IO profile and then size it properly.
- Use SSD disks with AO for auto tiering - it is great feature
- Has good support and integration with VMware, SRM
the issues I have seen, is the bottle neck in hadling the throughput by the controllers. So simply adding more spindles wont give the performance, you need properly analyse the current peak load (MB/s) and check with the vendor, the advantage is you can add more controller at later stage, so if you add 4 controller then it will be good.