Table 67 Reserve Element (10) Command - Quantum SuperLoader DLT User Manual

Reserve
Table 67
Element (10)
Command
Field
3rd Pty
LongID
Element
Reservation
Identification
Third Party
Device ID
Parameter List
Length
Description
When set to 1, it indicates that the Third Party Device ID field is valid.
When 0, indicates that the third party device associated with the
reservation release has a number smaller than 255 and the ID value can be
sent within the CDB. If set = 1, indicates that the third party device ID is
greater than 255, the ID value within the CDB is ignored, and the
parameter list length is at least eight.
Not supported. Must be 0.
Ignored.
Required and used only when the 3rdPty bit is set, in which case this field
specifies the SCSI ID of the initiator to be granted the reservation of the
logical unit. The drive preserves the reservation until one of the following
occurs:
• It is superseded by another valid RESERVE command from the initiator;
• It is released by the same initiator;
• It is released by a TARGET RESET message from any initiator;
• It is released by a TARGET RESET message from any initiator; or
• It is released by a hard reset condition.
The media changer ignores any attempt to release the reservation made by
any other initiator. For example, if ID7 sends ID2 a Third Party reservation
on behalf of ID6 (the target at ID2 gets reserved for the initiator ID6), then
only ID7 can release the target at ID2 (using a Third Party release). ID6
cannot release the reservation even though the reservation was made on its
behalf.
This field specifies the length, in bytes, of the parameter list that will be
transferred from the initiator.
If the LongID bit = 1 and the Element bit = 0, then the parameter
list length is eight and the parameter list has the following format.
Quantum ATL SuperLoader Software Interface Guide
Chapter 3 Media Changer Commands
Reserve Element (10) Command (56h)
161