Clearing ACA on CHECK CONDITION

Monia, Charles cmonia at corp.adaptec.com
Thu Jun 1 13:03:01 PDT 2000


* From the T10 Reflector (t10 at t10.org), posted by:
* "Monia, Charles" <cmonia at corp.adaptec.com>
*
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> -----Original Message-----
> From: Costa Sapuntzakis [mailto:csapuntz at cisco.com]
> Sent: Thursday, June 01, 2000 10:06 AM
> To: t10 at t10.org
> Subject: Clearing ACA on CHECK CONDITION
>=20
>=20
> * From the T10 Reflector (t10 at t10.org), posted by:
> * Costa Sapuntzakis <csapuntz at cisco.com>
> *
>=20
> In Section 5.6.1.1 of the SAM-2 03/27/00, it states that:
>=20
> If the logical unit accepts a value of one for the NACA bit and
> this bit was set to one in the CONTROL Byte of the faulting comand,
> then the SCSI-2 rules for clearing a contignent aleegiance condition
> shall not apply, In this case, the ACA condition shall only be =
cleared
> by:
> ....
> d) A command with the ACA attribute terminates with a CHECK CONDITION
> status
>=20
> ---------------------
>=20
> Part d) seems dangerous. For example, if during recovery, the=20
> initiator=20
> sends an unsupported CDB and gets CHECK CONDITION,=20
> ACA is cleared!
>=20

Hi Costa:

Here's my interpretation, for what it's worth:

I believe the previous ACA condition is replaced by a new condition =
caused
by the error which gave rise to the most recent CHECK CONDITION status. =
 Of
course, the Logical Unit's copy of the sense data from the previous
condition is overwritten.

Charles
Charles Monia
Adaptec Inc.
691 South Milpitas Blvd
Milpitas, CA 95035
M/S 135
=A0
email: cmonia at corp.adaptec.com =20
voice: (408) 957-6977
Fax:=A0 (408) 945-6736
=A0



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