Dual fabric connection issues

Hi Experts 

 

i have somewhat of a tricky situation. we are in the middle of new storage deployment and having some strange connectivity issues between our DELL R730 hosts and our new DELLEMC unity 480 XT storage system. hosts are connected through 2 brocade switches 6502.

 

both paths logs into the array and can see existing Luns but whenever we create a new Lun our VMware hosts are unable to create a VMFS datastore on the LUN. i have checked for existing partitions  and non exist. i have even cleared the partition to be safe using partutil. 

it seems as we can only create VMFS datastores if we just have a connection to 1 of the switches.

from the VMkernel log we see the following error which indicates the HBA aborted the I/O  

 

 

2020-04-08T22:02:50.201Z cpu63:33753)ScsiDeviceIO: 2595: Cmd(0x43b61763a600) 0x28, CmdSN 0x248db0 from world 3192104 to dev "naa.60a9800064734449426f69306630525a" failed H:0x8 D:0x0 P:0x0

2020-04-09T13:08:18.635Z cpu57:2098251)NMP: nmp_ThrottleLogForDevice:3802: Cmd 0x2a (0x45a28fb82080, 2100216) to dev "naa.6006016007f04e00311d8f5eaefa8f6a" on path "vmhba4:C0:T1:L0" Failed: H:0x8 D:0x0 P:0x0 Invalid sense data: 0x0 0x0 0x0. Act:EVAL

2020-04-09T13:08:18.635Z cpu57:2098251)ScsiDeviceIO: 3449: Cmd(0x45a28fb82080) 0x2a, CmdSN 0x9 from world 2100216 to dev "naa.6006016007f04e00311d8f5eaefa8f6a" failed H:0x8 D:0x0 P:0x0 Invalid sense data: 0x0 0x44 0x3a.

2020-04-09T13:22:42.934Z cpu50:2098251)NMP: nmp_ThrottleLogForDevice:3802: Cmd 0x2a (0x45a28f005a40, 2100216) to dev "naa.6006016007f04e00311d8f5eaefa8f6a" on path "vmhba4:C0:T1:L0" Failed: H:0x8 D:0x0 P:0x0 Invalid sense data: 0x0 0x0 0x0. Act:EVAL

2020-04-09T13:22:42.934Z cpu50:2098251)ScsiDeviceIO: 3449: Cmd(0x45a28f005a40) 0x2a, CmdSN 0xf from world 2100216 to dev "naa.6006016007f04e00311d8f5eaefa8f6a" failed H:0x8 D:0x0 P:0x0 Invalid sense data: 0x0 0x44 0x3a.