zfs create -V 1G zpoolA/iscsi_luns/vol001
zfs set shareiscsi=on zpoolA/iscsi_luns/vol001
few days back there was a thread for vxfentsthdw script causing node hang
the thread is for different issue & different platform though, I would suggest to run same checks as mentioned in above link... both the threads show problem at same layer
In your case, read/write/reserve test is getting passed from node1 however at the same time node2 is also able to write that is why last test seems to be failed .... could be possible that you might need to land opening a support case...
One more thing, what is the fencing mode you are using ?
I see the VCS install guide
The coordinator disks can be raw devices, DMP devices, or iSCSI devices.
You must use DMP disk policy for iSCSI-based coordinator disks.
For the latest information on supported hardware visit the following URL: