Persistent reservation clarification needed

Wed May 22 06:46:14 PDT 2002

* From the T10 Reflector (t10 at t10.org), posted by:
* "Ulrich, David" <dulrich at lsil.com>
*
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I'm looking for some background information that would help explain the
rationale for the following, found on page 135 of SPC-3 revision 7.

If the last valid APTPL bit value received by the device server is zero,
the loss of power in the SCSI target device 
shall release the persistent reservation for all logical units and
remove all registered reservation keys (see 5.5.2.4).

If the last valid APTPL bit value received by the device server is one,
the logical unit shall retain any persistent reservation(

s) that may be present and all reservation keys (i.e., registrations)
for all initiator ports even if power is lost 
and later returned (see 5.5.2.2). 

Specifically, why does an APTPL value of 0 affect all luns while a value
of 1 address only the lun the command was issued to?

Thanks in advance, 

David Ulrich 
LSI Logic Storage Systems Division 

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Persistent reservation clarification needed 
I'm looking for some background = information that would help explain the rationale for the following, = found on page 135 of SPC-3 revision 7. If the last valid APTPL bit value received by the device server is zero, the = loss of power in the SCSI target device 
shall release the persistent = reservation for all logical units and remove all registered reservation = keys (see 5.5.2.4). If the last valid APTPL bit value received by the device server is one, the = logical unit shall retain any persistent reservation( s) that may be present and all = reservation keys (i.e., registrations) for all initiator ports even if = power is lost 
and later returned (see = 5.5.2.2). Specifically, why does an APTPL value = of 0 affect all luns while a value of 1 address only the lun the = command was issued to? Thanks in advance, David Ulrich 
LSI Logic Storage Systems = Division 
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