Product manual

SCSI Description
Maxtor Atlas 10K IV 5-73
Table 5-107 Read Keys Parameters-Field Descriptions
The data format and field descriptions for the Read Reservations Parameters are
described in Table 5-108 and Table 5-109 respectively.
Table 5-108 Read Reservations Parameters-Data Format
Data Field Description
Generation
The value in this field is a 32-bit counter in the device server that is incremented each time a PER-
SISTENT 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 Re-
lease service action, or by a PERSISTENT RESERVATION OUT command that is not done due
to an error or a reservation conflict. The valuein 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 client doing the examination.
Additional
Length
This field contains the count of the number of bytes that are in the Reservation Key list (bytes 8 –
n). 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 command’s CDB.
Reservation Keys
Each of the Reservation Keys appear as items in a list as bytes 8 through n. Each entry reflects an
8-byte reservation key registered with the device server via the PERSISTENT RESERVATION
OUT, Reserve, Pre-empt, Pre-empt and Clear, or Register service actions. Each key can be exam-
ined by the application client for correlation with a set of initiators and SCSI ports
Bit
Byte
765 4 3210
0-3
(MSB)
Generation
(LSB)
4-7
(MSB)
Additional Length (n –7)
(LSB)
8-n
(MSB)
Reservation Descriptors
(See Figure 5-53 / Table 5-55 for detail of a Descriptor Field)(LSB)