I have error alerts which says "Disk shelf 12 is connected to HBA ports 2a and 2b which are both controlled by a single chip." what does this mean .
On the controller if i run sysconfig -a , it shows up as multipath HA.
The HBA has 4 ports, a- d but only 2 ASICs (Application Specific Integrated Circuits).
One of the ASICs controls ports a & b, and the other controls ports c & d.
In your case, this makes the ASIC a single point of failure.
You should use either ports a & c or ports b & d.
That way, even if one of the ASICs should fail, you will still have connectivity to the disk shelf.