Thanks for the input Hicksb8. I am doing this on my practice cluster luns are iscsi based.

I am just trying to implement the SCSI3 reservation on two path devices in cluster.

In first logs I just wanted to change the global_ default fencing to prefer3 mean scsi3 where it change all the reservation of shared disks from scsi2 to scsi3 except quorum device d6 which have I have to change it manually by adding d4 device as quorum (while adding this d4 device(Scsi3) in cluster, my command got hanged ). If my command didn't got hanged & went smoothly then remove the d6 from quorum device control then change the default_fencing parameter of device d6 to global from pathcount . After this I wanted to add the d6 in quorum device. & remove the d4 from quorum control. As in two node cluster we cannot directly remove the d6 (single)quorum device due to quorum of the server will be compromised untill & unless we put the cluster in installedmode which I did in seconds logs.

In both the above logs/procedure you will notice I am trying to add disk which is having scsi 3 reservation. Is due to adding the scsi3 reservation disk in quorum control my cluster got hanged both the times in above mention both logs meaning even simple "clq status" got hanged then I need to take the cluster reboot . As per my knowledge only these two process are to implement scsi3 reservation on two path devices.

My cluster is 3.2 & kindly let me know is their any way to implement scsi3 reservation on two path devices including quorum device.