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Scope The value in this field indicates whether a persistent reservation applies to
an entire logical unit, to a part of the logical unit (defined as an extent), or
to an element.
The values for the Scope field are:
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0h LU Logical Unit. Persistent reservation applies to
the full logical unit. The LU scope is therefore
implemented by all device servers that
implement PERSISTENT RESERVATION OUT.
1h Extent Persistent reservation applies to the specified
extent. When Extent is the scope, it indicates
that the persistent reservation applies to the
extent of the logical unit defined by the Scope-
Specific Address and Extent Length fields in the
PERSISTENT RESERVATION OUT
command’s parameter list. Note that an extent
is defined only for devices defining contiguous
logical block addresses. The Extent scope is
optional for all device servers that implement
PERSISTENT RESERVATION OUT.
2h Element Persistent reservation applies to the specified
element. When Element is the scope, it
indicates that the persistent reservation applies
to the element of the logical unit defined by the
Scope-Specific Address field in the
PERSISTENT RESERVATION OUT parameter
list. An element is as defined by the SCSI-3
Medium Changer Commands (SMC) standard.
The Element scope is optional for all device
servers that implement PERSISTENT
RESERVATION OUT.
3h – Fh Reserved Reserved
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