I finally resolved my problems : 1) i had a wrong Jumbo frame configuration: the array only supports 8900MTU so i put 9000 on the iscsi switches (i think i can put even more ) and 8900 MTU on the pve hosts interfaces and everything worked smoothly (The multipath conf above is right). Thank you for your help  
Hello and thank you for you insights, I have a PVE cluster and i want the volumes on ME4024 to be handled by multipathing on the cluster. I configured my controllers like this :   [IMAGE] And configured 2 SAN switches with 2 separate non routed private vlan as suggested by Vendors. On PVE i declared the 8 controllers ip as ISCSI Portals.   [IMAGE]   And then when i map a volume on all my 3 initiators and use multipath i have theses errors : iscsid: Kernel reported iSCSI connection 1:0 error (1022 - ISCSI_ERR_NOP_TIMEDOUT: A NOP has timed out) state (3)Feb 28 14:11:20 pve3 kernel: [ 543.556114] connection6:0: ping timeout of 5 secs expired, recv timeout 5, last rx 4295025408, last ping 4295026688, now 4295027968Feb 28 14:11:20 pve3 kernel: [ 543.558146] connection6:0: detected conn error (1022)Feb 28 14:11:21 pve3 iscsid: Kernel reported iSCSI connection 6:0 error (1022 - ISCSI_ERR_NOP_TIMEDOUT: A NOP has timed out) state (3)Feb 28 14:11:21 pve3 iscsid: connection1:0 is operational after recovery (1 attempts)Feb 28 14:11:23 pve3 pmxcfs[1709]: [quorum] crit: quorum_initialize failed: 2Feb 28 14:11:23 pve3 pmxcfs[1709]: [confdb] crit: cmap_initialize failed: 2   I've seen somewhere that it occurs because multiple hosts are using the same iscsi initiator name. So why can't i declare each controller with different iqn and do you think it's the problem i'm facing?     Thanks a lot.  
ISCSI question on ME4024