RE: Data in SCSI Response or SCSI Data

["Douglas Otis" <dotis@sanlight.net>]

Steph,

Although a logical use of a residual, I can not see where it is defined
should the allocation length be greater than the returned length.  Should
the allocation be less than the response, this is a Check Condition and the
residual is defined.  It would seem a residual in a case with adequate
allocation is not interesting or defined.  Do you know where this mechanism
you describe is defined?  In normal use, without a Check Condition such
information is not returned to the application.

Doug

> -----Original Message-----
> From: owner-ips@ece.cmu.edu [mailto:owner-ips@ece.cmu.edu]On Behalf Of
> Stephen Bailey
> Sent: Wednesday, September 06, 2000 3:45 PM
> To: ips@ece.cmu.edu
> Subject: Re: Data in SCSI Response or SCSI Data
>
>
> > When do you get GOOD status and residual counts on a read?
> What is causing
> > the target to get the length wrong?
>
> One example is an INQUIRY command.  The inquiry data length is
> target-specific.  Typically the CDB allocation length (and DL) are set
> to some arbitrary large value (0xff), and the target sends back
> everything it has.  The transfer ends with success status.
>
> There can certainly be transfer residual and no SCSI error status.
>
> Steph
>