RE: Data in SCSI Response or SCSI Data

[Robert Reynolds <robertr@Crossroads.com>]

> -----Original Message-----
> From: Stephen Bailey [mailto:steph@cs.uchicago.edu]
> Sent: Wednesday, September 06, 2000 5:45 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.


  Another example is on variable block tape reads.  The Initiator
  uses an arbitrary size to read the block and the target sends all
  the data in that block.  In many cases the amount of data returned
  is less than the amount of data asked for but it is still a GOOD
  status.

    Bob