Maxtor 10K V - Manual (Page 132)

5-74 Maxtor Atlas 10K V
Table 5-103
PERSISTENT RESERVATION IN Command-Field Descriptions
The data format and field descriptions for the Read Keys Parameters are described in
Table 5-104 and Table 5-105 respectively.
Table 5-104
Read Keys Parameters-Data Format
Data Field Description
Service Action Service actions that require information about persistent reservation and registrations may require
enabling of nonvolatile memory within the logical unit.
Service action codes available are:
Code Name Description
00h Read Keys Reads all registered Reservation keys
01h Read Reservations Reads all current persistent reservations
02 – 1Fh Reserved
A “Read Keys” service action requests that the device server return a parameter list that includes
a header and a complete list of all of the reservation keys currently registered with the device serv-
er. If multiple initiators have registered with the same key, then the key is listed multiple times,
once for each registration. Refer to Table 5-104 and Table 5-105 for information about Read Keys
parameter data.
A “Read Reservation” service action requests that the device server return a parameter list that
contains a header and a complete list of all persistent reservations that are presently active in the
device server and its extents. Note that duplicate persistent reservations from the same initiator are
not reported. Refer to Table 5-108 and Table 5-107 for information about Read Reservations pa-
rameter data.
Allocation
Length
This field indicates how much space has been reserved for the returned parameter list (Read Keys
or Read Reservations parameters). The actual length of the parameter data is indicated in the pa-
rameter data field for those parameters.
If the Allocation Length is not sufficient to contain the entire list of parameters, the first portion
of the list that does fit is returned. If it is determined that the remainder of the list is required, the
client should send a new PERSISTENT RESERVATION IN command with an Allocation Length
field large enough to contain the entire list of parameters.
Bit
Byte
7 6 5 4 3 2 1 0
0 - 3
(MSB)
Generation
(LSB)
4 - 7
(MSB)
Additional Length (n – 7)
(LSB)
(Reservation Key List Follows in Bytes 8 – n)
8 - 15
(MSB)
First Reservation Key
(LSB)
n – 7 to n (MSB)
Last Reservation Key
(LSB)