Re: iSCSI : Digest Error Problems & CmdSN/ExpCmdSN window issues

[Matt Wakeley <matt_wakeley@agilent.com>]

Santosh Rao wrote:
> 
> To summarize :
> o       Dis-allow overlapped data xfer's.
> 
> o       Initiators to perform a count check as is done in FC.
> 
> o       On detecting an underrun, the command may be retried
>         BUT WITHOUT SETTING the "retry" bit. This is
>         particularly important because targets that implement
>         status recovery may be ignorant of the fact that the
>         initiator encountered a digest error [which caused
>         the underrun] and so, they just send back a Status
>         PDU under the belief that the command is complete,
>         whereas, the initiator wants all the Data PDUs
>         to be re-sent.

A retry MUST resend all the data as well as the status.

-Matt