Maxtor ATLAS 10K III - Manual (Page 153)

SCSI Description
Maxtor Atlas 10K III 5-89
Table 5-109 PERSISTENT RESERVATION IN Command-Field Descriptions
The data format and field descriptions for the Read Keys Parameters are described in
Table 5-110 and Table 5-111 respectively.
Table 5-110 Read Keys Parameters-Data Format
&CVC (KGNF &GUETKRVKQP
Service Action Service actions that require information about persistent reservation and registra-
tions 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 reg-
istered with the device server. If multiple initiators have registered with the same
key, then the key is listed multiple times, once for each registration. Refer to Table
5-110 and Table 5-111 for information about Read Keys parameter data.
A “Read Reservation” service action requests that the device server return a param-
eter 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 persis-
tent reservations from the same initiator are not reported. Refer to Table 5-114 and
Table 5-113 for information about Read Reservations parameter 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 parameter 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.
$KV
$[VG
       
0 - 3
(MSB)
Generation
(LSB)
4 - 7
(MSB)
Additional Length ( 2 – 7)
(LSB)
(Reservation Key List Follows in Bytes 8 – 2)
8 - 15
(MSB)
First Reservation Key
(LSB)
2 – 7 to n (MSB)
Last Reservation Key
(LSB)