Question on restoring saved mode parameters

Bellamy, Wayne (mellow fellow) Wayne.Bellamy at
Thu Mar 21 07:51:07 PDT 2013

Formatted message: <a href="">HTML-formatted message</a>

Agreeing with Kevin and Gerry.
From: owner-t10 at [mailto:owner-t10 at] On Behalf Of
Kevin_Marks at
Sent: Wednesday, March 20, 2013 2:57 PM
To: gerry.houlder at; t10 at
Subject: RE: Question on restoring saved mode parameters
Yes, assuming there are saved mode parameters.
From: owner-t10 at<mailto:owner-t10 at> [mailto:owner-t10 at]
On Behalf Of Gerry Houlder
Sent: Wednesday, March 20, 2013 9:12 AM
To: T10 Reflector
Subject: Question on restoring saved mode parameters
A question has come up on whether hard reset (e.g., the HARD_RESET primitive
is SAS) should cause saved mode parameters to be restored in a SCSI target
SPC-4 is pretty clear that a power on event or a logical unit reset shall
cause saved parameters to be restored, but is silent about hard reset.
However, SAM-5 has wording stating "A SCSI target port's response to a hard
reset condition shall include a logical unit reset condition (see 6.3.3) for
all logical units to which the SCSI target port has access", which suggests
that a hard reset shall include all behavior specified for a logical unit
reset (per SPC-4, this includes restoring saved mode parameters).
I think the correct interpretation is that hard reset restores saved mode
parameters, even though hard reset is not mentioned in SPC-4 as an event that
causes saved parameters to be restored. Does anyone disagree with this?

More information about the T10 mailing list