Multiple Connections per Session
The Linux SCSI Target Wiki
Multiple Connections per Session (MC/S) means using multiple communication paths in a single session ("I_T Nexus"). Architectural session command ordering is preserved across those communication paths.
Multiple iSCSI connections per iSCSI session (MC/S) means creating multiple communication paths across TCP, SCTP or iSER & RCaP connections. Session-wide command (CmdSN defined) ordering is preserved per RFC 3720 to ensure in-order delivery of tasks from an SCSI Initiator Port to an SCSI Target Port as defined by the SCSI Architecture Model, in which iSCSI provides the SCSI transport.
- Add additional connections on the fly with active+inactive IO (non-leading login)
- Remove connections on the fly with active+inactive IO (explict logout)
- Remove connections on the fly on a different connection with active+inactive IO (different CID explict logout)
- Restart session+connections during single connection failure (session reinstatement)
- Multiple connection sessions to the same and different network portals (iSCSI trunking)
RFC 3720: Internet Small Computer Systems Interface (iSCSI)