Sony SDX-800V/R manual Persistent Reservation Scope Codes, Name Description

PERSISTENT RESERVE IN 6.Command Specification

SCOPE: The value in this field indicates whether a persistent reservation applies to an entire logical unit to an element. The value in this filed are defined in table 6-58.

Table 6-58: PERSISTENT RESERVATION SCOPE Codes

Code	Name	Description
0h	Logical Unit	Persistent reservation applies to the full logical unit
1h		Obsolete
2h	Element (not supported in this drive)	Persistent reservation applies to the specified element
3h-fh	Reserved	Reserved

Logical Unit: A SCOPE value of Logical Unit indicates that the persistent reservation applies to the entire logical unit. The Logical Unit scope shall be implemented by all device servers that implement PERSISTENT RESERVE OUT.

Element: A SCOPE filed value of Element indicates that the persistent reservation applies to the element of the logical unit defined by the SCOPE-SPECIFIC Address field in the PERSISTENT RESERVE OUT parameter list.

The drive do not support it.

TYPE: The value in the TYPE filed specify the characteristics of the persistent reservation being established for all data blocks within the element or within the logical unit. Table 6-59 defines the characteristic of the different type values. For each persistent reservation type, table 6-59 lists code value and describes the required device server support. In this table, the description of required device server support is divided in two paragraphs. The first paragraph defines the required handling for read operations. The second paragraph defines the required handling for write operations.

		Table 6-59: PERSISTENT RESERVATION TYPE Codes
Code	Name		Description
0h			Obsolete
1h	Write		Reads Shared: Any application client on any initiator may execute tasks that request
	Exclusive		transfers from the storage medium or cache of the logical unit to the initiator.
			Writes Exclusive: Any task from any initiator other than the initiator holding the
			persistent reservation that requests a transfer from the initiator to the storage medium
			or cache of the logical unit shall result in a reservation conflict.
2h			Obsolete
3h	Exclusive		Reads Exclusive: Any task from any initiator other than the initiator holding the
	Access		persistent reservation that requests a transfer from the storage medium or cache of
			the logical unit shall result in a reservation conflict.
			Write Exclusive: Any task from any initiator other than the initiator holding the
			persistent reservation that requests a transfer from the initiator to the storage medium
			or cache of the logical unit shall result in a reservation conflict.
4h			Obsolete
5h	Write		Reads Shared: Any application client on any initiator may execute tasks that request
	Exclusive-		transfers from the storage medium or cache of the logical unit to the initiator.
	Registrants		Writes Exclusive: Any task from any initiator other than the initiator holding the
	Only		persistent reservation that requests a transfer from the initiator to the storage medium
			or cache of the logical unit shall result in a reservation conflict.
6h	Exclusive		Reads Exclusive: A task that requests a transfer from the storage medium or cache
	Access-		of the logical unit to an initiator that has not previously requested a REGISTER
	Registrants		service action with the drive shall result in a reservation conflict.
	Only (not		Write Exclusive: Any task from any initiator other than the initiator holding the
	supported in		persistent reservation that requests a transfer from the initiator to the storage medium
	this drive)		or cache of the logical unit shall result in a reservation conflict.
7h-Fh	Reserved

SONY AIT-3Ex drive SDX-800V series Ver.1.1 6-61