The Performance Manager stats (if you use ECC) will show at an FA level how even the IO rate is across the 4 FA's. If other hosts use the same 4 FA's and they are doing unbalanced IO then you may still see unbalanced IO even though your host is balancing IO. You can also check your switch port stats that the host connects in to. These should show balanced IO rate. Failing that, perhaps you could consider a PowerPath install - it has a display function that shows IO's to the FA ports. :-)
Hi All,  Does anyone knows how to check that a particular LUN is getting I/O's from which FA path. We have a scenario here wherein we have mapped a LUN to 4 FA's and due to MPIO policy set to failover it was just using 1 FA path to access the LUN which was causing the congestion on that FA port. But now System Admin has changed the MPIO policy to round robin. I want to check if now the LUN is receiving I/O from all the paths. Array: Symmetrix DMX4  Thanks in Advance..
How to check LUN is receiving I/O's from which FA path.