iSCSI: CmdSN checking and immediate

[pat_thaler@agilent.com]

We have a question about CmdSN checking for immediate commands. 2.2.2.1 (near the top of page 31) says clearly that the target must check CmdSN on non-immediate commands and reject those outside of range. What it doesn't make clear is the intention for immediate commands. Are they MUST NOT check or are they MAY check?

 

It probably should be MUST NOT check for immediate commands because when commands arrive in order, they will arrive with a CmdSN less than ExpCmdSN because they will have the same CmdSN as the preceeding non-immediate command. Also, where there are multiple TCP connections they may arrive out of order and have even eariler numbers. However, I can't think of any reason that they would have a value higher than MaxCmdSN.

 

Regards,

Pat