Maxtor ATLAS 10K III - Manual (Page 154)

SCSI Description
5-90 Maxtor Atlas 10K III
Table 5-111 Read Keys Parameters-Field Descriptions
The data format and field descriptions for the Read Reservations Parameters are
described in Table 5-112 and Table 5-113 respectively.
Table 5-112 Read Reservations Parameters-Data Format
&CVC (KGNF &GUETKRVKQP
Generation
The value in this field is a 32-bit counter in the device server that is incremented
each time a PERSISTENT RESERVATION OUT command requests a Register, Clear,
Pre-empt, or Pre-empt and Clear operation. Note that PERSISTENT RESERVATION
IN commands do not increment the counter, nor do PERSISTENT RESERVATION
OUT commands that perform a Reserve or Release service action, or by a PERSIS-
TENT RESERVATION OUT command that is not done due to an error or a reservation
conflict. The value in the Generation field is set to 0 as part of the power on or reset
processes.
The value in the Generation field allows the application client that examines the value
to verify that the configuration of the initiators attached to a logical unit has not been
modified by another application client without any notification of the application cli-
ent doing the examination.
Additional
Length
This field contains the count of the number of bytes that are in the Reservation Key
list (bytes 8 –
2). Note that this field contains the number of bytes in the reservation
key list regardless of the value prescribed by the Allocation Length field in the com-
mand’s CDB.
Reservation
Keys
Each of the Reservation Keys appear as items in a list as bytes 8 through 2. Each
entry reflects an 8-byte reservation key registered with the device server via the PER-
SISTENT RESERVATION OUT, Reserve, Pre-empt, Pre-empt and Clear, or Register
service actions. Each key can be examined by the application client for correlation
with a set of initiators and SCSI ports
$KV
$[VG
       
0 - 3
(MSB)
Generation
(LSB)
4 - 7
(MSB)
Additional Length ( 2 – 7)
(LSB)
8 - 2
(MSB)
Reservation Descriptors
(See Figure 5-53 / Table 5-55 for detail of a Descriptor Field)(LSB)