Error Handling in ATAPI

Jim McGrath jmcgrath at mail.qntm.com
Thu Oct 13 17:44:07 PDT 1994


                      Subject:                              Time:  5:39 PM
  OFFICE MEMO         Error Handling in ATAPI               Date:  10/13/94


Since you can issue a subsequent command in ATAPI to get
more sense data, the question arises as to how that is done
in a queuing environment.  The easy answer is that the tag
for the command with the error is passed to the device with
the REQUEST SENSE command (as packet information - there
are lots of reserved bytes).  The device must maintain sense
data for all commands until the tag is reused by the host.
Thus it appears for a queue depth of n, up to n sense blocks
must be maintained.

How is that for people?

Jim






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