Question on restoring saved mode parameters

Ralph Weber roweber at
Thu Mar 21 07:32:52 PDT 2013

* From the T10 Reflector (t10 at, posted by:
* Ralph Weber <roweber at>
If memory serves, I have heard this trail of breadcrumbs being described 
in exactly the way that you have deduced. It is also possible that the 
exact connect-the-dots approach (i.e., SPC-SAM-SPC) was held to be the 
best way to describe the situation while maintaining the flexibility to 
change the right thing in the right place.
All the best,
On 3/20/2013 9:11 AM, Gerry Houlder wrote:
> Hi,
> 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 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?
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