Hello.
We have a cluster of 7 nodes. VMs and LXCs are stored on external storage, on a shared LVM, via iSCSI.
We recently had to move from a 2 x 1Gbps iSCSI multipath connection to a 1 x 10 Gbps FO ethernet (single link iSCSI connection, no multiphating).
The iSCSI storage has 4 ethernet ports...