Maxtor 10K III manual Parameters, As Additional Reservations Allowed in the table, Reservation OUT

SCSI Description

	PERSISTENT RESERVATION IN Read Reservations Descriptor-Field Descriptions
Reserva&CVC(KGNF￿-	The Reservation key field contains an 8-&GUETKRVKQPbyte value that identifies the reservation key under
tion Key	which the persistent reservation is held.
	If the Scope field (Byte 13, bits 4 – 7) represents an “Extent” reservation, the Scope-Specific
	Address field contains the logical block address (LBA) of the first block of the extent and the
Scope-	Extent Length field (Bytes 14 – 15) contains the number of blocks in the extent.
Specific	If the Scope field represents an “Element” reservation, the Scope-Specific Address field con-
Address
	tains the Element address, zero-filled in the most significant bytes to fit the field and the Ex-
	tent Length field is set to zero.
	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:
	Code Name Description
	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
Scope	the Scope-Specific Address and Extent Length fields in the PERSISTENT RESERVATION OUT
Table5-115command’s parameter list. Note that an extent is defined only for devices defining contigu-
	ous logical block addresses. The Extent scope is optional for all device servers that imple-
	ment 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 param-
	eter list. An element is as defined by the SCSI-3 Medium Changer Commands (SMC) stan-
	dard. The Element scope is optional for all device servers that implement PERSISTENT
	RESERVATION OUT.
	3h – Fh Reserved
	The value of the Type field specifies the characteristics of the persistent reservation being
Type	established for all data blocks within the extent or within the logical unit. Refer to Table 5-
	56 for the applicable Type codes and their meanings
	Table 5-116presents the definitions of the characters of the available “Type” values
	from the Type field of the PERSISTENT RESERVATION IN Read Reservations
	parameters.
	Each of the codes provides handling instructions for READ operations, for WRITE
	operations, and for subsequent attempts to establish persistent reservations (referred to
	as “Additional Reservations Allowed” in the table).

5-92 Maxtor Atlas 10K III