iscsi-cmdsn · shipping · also CmdSN

iSCSI Command Sequence Number

An iSCSI Command Sequence Number (CmdSN) identifies a command's position in the session-wide delivery sequence.

It is a 32-bit serial number; immediate commands carry the current value without advancing it. ExpCmdSN and MaxCmdSN delimit the command window. Delivery ordering is not a durability guarantee. [1]

The paired analysis includes an illustrative cross-connection trace, not measured traffic. [2]

Relations

related

iscsi, iscsi-session, iscsi-statsn

Citations

1. RFC 7143: iSCSI numbering, section 4.2.2.1 (accessed 2026-10-17)
2. Hesela: iSCSI identity, sessions and recovery (accessed 2026-10-17)

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