hi iam not a san expert.
but let me tell you wat i did.
controllerA fca and controllerB fca goes to switch 1 and controllerA fcb and controllerB fcb goes to switch 2 .
basic zoning on the switches mentioned no of storage ports 2 on each switch and no of hbas 4 in the san switch and connected cables to the assigned ports for stoage and hbas respectively.
this was just fine when only one switch was configured/zoned when both are configured its not able to see the luns .
no idea why..
thanks
manek