Question on restoring saved mode parameters

Gerry Houlder gerry.houlder at
Wed Mar 20 07:11:40 PDT 2013

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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 device.
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
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?

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