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SCSI Description
Maxtor Atlas 10K III 5-91
Read Reservations Parameters-Field Descriptions
The data format and field descriptions for the PERSISTENT RESERVATION IN
Read Reservations Descriptor are described in Table 5-114 and Table 5-115
respectively.
PERSISTENT RESERVATION IN Read Reservations Descriptor-Data Format
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 of Reservation descriptors
(bytes 8 –
). Note that this field contains the number of bytes regardless of the val-
ue prescribed by the Allocation Length field in the command’s CDB.
Reservations
Descriptors
One Reservation descriptor is reported for each unique persistent reservation on the
logical unit when the PERSISTENT RESERVATION IN command has indicated a Read
Reservations action. Table 5-118 and Table 5-115 detail the contents of each Res-
ervation Descriptors field.
0 - 7
(MSB)
Reservation Key
(LSB)
8 - 11
(MSB)
Scope-Specific Address
(LSB)
12 Reserved
13 Scope Type
14 -
15
(MSB)
Extent Length
(LSB)