09-05-2011 11:47 PM
Could be, as mentioned try to adhere these basic rules:
- as simple zoning as possible (aka as few criss-cross connections as possible)
- optimally 4 paths per target, one per fabric per controller
- if multipathing gives trouble, you can reduce to 2 paths (especially for active-passive storage, this might help)
If you have issues like mentioned - one MPIO works, other does not - you need to dig into root cause which is usualy MPIO stack-specific.
Sometimes just re-zoning resolves the issue (welcome to black magic ).
Here is where point-to-point zoning helps as it gives nice visibility and ability to enable/disable specific paths for troubleshooting.