Table 5-109 Read Reservations Parameters-Field Descriptions - Maxtor ATLAS 10K IV User Manual

SCSI Description
Table 5-109
Data Field
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
Generation 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 client doing the examination.
This field contains the count of the number of bytes of Reservation descriptors (bytes 8 – n). Note
Additional
that this field contains the number of bytes regardless of the value prescribed by the Allocation
Length
Length field in the command's CDB.
One Reservation descriptor is reported for each unique persistent reservation on the logical unit
Reservations De-
when the PERSISTENT RESERVATION IN command has indicated a Read Reservations action.
scriptors
Table 5-114 and Table 5-111 detail the contents of each Reservation Descriptors field.
The data format and field descriptions for the PERSISTENT RESERVATION IN
Read Reservations Descriptor are described in Table 5-110 and Table 5-111
respectively.
PERSISTENT RESERVATION IN Read Reservations Descriptor-Data Format
Table 5-110
Bit
Byte
(MSB)
0 - 7
(MSB)
8 - 11
12
13
(MSB)
14 - 15
5-74 Maxtor Atlas 10K IV
Read Reservations Parameters-Field Descriptions
7 6 5
Scope
Description
4 3
Reservation Key
Scope-Specific Address
Reserved
Extent Length
2 1 0
(LSB)
(LSB)
Type
(LSB)