2018-05-09 11:37 GMT+03:00 Gianluca Cecchi <gianluca.cecchi@gmail.com>:

I have the hierarchy
../target/tpg/luns/[lun0,lun1,lun2]

so it seems I have to create two different targets and put the hosted engine lun under target1/tpg1 and then the data domain luns under target2/tpg2

No. You are missing the logic here. Path /target meants that following is a iSCSI target. Each LUN is different target.

You can see more here https://www.thomas-krenn.com/en/wiki/ISCSI_Basics#iSCSI_Target

Veiko