Storage: iSCSI - Proxmox VE
https://pve.proxmox.com/wiki/Storage:_iSCSISo Proxmox VE iSCSI volume names just encodes some information about the LUN as seen by the linux kernel. Storage Features iSCSI is a block level type storage, and provides no management interface. So it is usually best to export one big LUN, and setup LVM on top of that LUN. You can then use the LVM plugin to manage the storage on that iSCSI LUN.
ISCSI Multipath - Proxmox VE
https://pve.proxmox.com/wiki/ISCSI_MultipathIf you use iSCSI, multipath is recommended - this works without configurations on the switches. (If you use NFS or CIFS, use bonding, e.g. 802.ad) The connection from the Proxmox VE host through the iSCSI SAN is referred as a path. When multiple paths exists to a storage device (LUN) on a storage subsystem, it is referred as multipath connectivity.