Re: iSCSI: SNACK wording clarification

["Matt Wakeley" <matt_wakeley@agilent.com>]

Trang Nguyen wrote:
> My questions are:
> 
> 1.  In the iSCSI I-D: "iSCSI uses Command and Status numbering schemes and a
> Data sequencing scheme.  It supports ordered command delivery within a
> session.  All commands (initiator-to-target) are numbered".  As I understand
> it means that the iSCSI initiator won't deliver the next PDU until it
> receives the acknowledgement from the target (through StatSN, ExpCmdSN).

That is incorrect.  The initiator may send up to MaxCmdSN-CmdSN commands.

> Also, the target executes the PDU with sequence number it expects.  It won't
> execute the out-ot-order PDU.  Am I understanding it right?

That part you got correct.

> 2.  From the section 6.3 "Sequence Errors", I have the impression that iSCSI
> can send multiple PDUs without waiting for the acknowledgement.

That's correct.

-Matt