3.1.18.1 Persistent Reserve In Service Actions; Read Keys - Fujitsu MAX3073NC - SCSI,80, Dell DC961,Hard Drive Scsi Logical Interface Specifications

Command Specifications
The PERSISTENT RESERVE IN command obtains information about the reservation requirements and
reservation keys that are valid in the target range. This command is used in combination with the
PERSISTENT RESERVE OUT command (See Section 3.1.19).
When this command is received, if the reservation in the target is enabled by the RESERVE command,
the command is rejected and is returned with the RESERVATION CONFLICT status.
If the reservation is enabled by a persistent reservation, this command can be executed normally.
The length of the PERSISTENT RESERVE IN parameter data that can be returned by this command is
displayed in the parameter data field. If the specified allocation length in the CDB is not sufficient for
containing the entire parameter list, a portion of the parameter list from byte 0 to the specified allocation
length is sent. This is not assumed to be an error. If the remaining part of the parameter must be read,
the initiator must specify a value that is sufficient for containing the entire list in the Allocation Length
field and issue the PERSISTENT RESERVE IN command again.

3.1.18.1 PERSISTENT RESERVE IN service actions

In a service action, nonvolatile memory in the logical unit may be required to be in the ready state to
access information about reservation requirements or registration (MA*3*** series product requires the
drive to be ready). If the nonvolatile memory is not ready, the drive returns the CHECK CONDITION
status. The sense key is set to NOT READY [=2]. The sense data is specified with the same value
returned by the TEST UNIT READY command.
The service action codes for the PERSISTENT RESERVE IN command are listed below.
Code
00h

READ KEYS

01h READ RESERVATIONS
02h-1Fh Reserved
3.1.18.1.1 READ KEYS
In the READ KEYS service action, the drive transfers the following information to the initiator as a
parameter data list.
•
Current generation value (See Section 3.1.18.2)
•
All of the reservation keys that are currently registered (8 bytes each)
If several initiators register the same key, the key is listed once for each registration. Therefore, the key
is displayed on the list as many times as the number of initiators. (The keys are not listed in the order of
their registration but in ascending order based on INIT IDs. For example, INIT ID#0 is listed first.) The
keys are registered in the REGISTER service action by the PERSISTENT RESERVE OUT command.
3-56
Name Description
Reads all of the registered reservation keys.
Reads all of the persistent reservations that are
currently enabled.
C141-C010