MSA1500 redundancy

[DDR_1]

I had the same issues - and after reviewing the quickspecs http://h18000.www1.hp.com/products/quickspecs/11945_div/11945_div.html it clearly states:

NOTE: Redundant configurations require two Host Bus Adapters per server, an additional controller and fibre channel I/O module, redundant switches and cables, and Secure Path (active passive configuration) software or Industry Standard failover depending on the operating system for each server.

I installed a second switch; updated msa firmware to 7.0 (for active/active) & drivers 7.67 with HP Full feature MPIO & everything now works fine.