SCSI Primary Commands - 2.pdf

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T10/1236-D Revision 20 18 July 20017.16 RELEASE(10) command7.16.1 RELEASE(10) command introductionThe RELEASE(10) command (see table 94) is used to release a previously reserved logical unit.Table 94 — RELEASE(10) commandBitByte7 6 5 4 3 2 1 00 OPERATION CODE (57h)1 Reserved 3RDPTY Reserved LONGID Obsolete2 Obsolete3 THIRD-PARTY DEVICE ID4 Reserved5 Reserved6 Reserved7 (MSB)PARAMETER LIST LENGTH8 (LSB)9 CONTROLThe RESERVE and RELEASE commands provide a basic mechanism for contention resolution in multiple-initiatorsystems. See 5.5.1 for a general description of reservations and the commands that manage them. A reservationmay only be released by a RELEASE command from the initiator that made it. It is not an error for an applicationclient to attempt to release a reservation that is not currently valid, or is held by another initiator. In this case, thedevice server shall return GOOD status without altering any other reservation.Byte 1 Bit 0 and Byte 2 provide an obsolete way to release previously reserved extents within a logical unit. If Byte1, Bit 0 is equal to one, device servers not implementing the obsolete capability shall terminate the command withCHECK CONDITION status and the sense key shall be set to ILLEGAL REQUEST.7.16.2 Logical unit releaseLogical unit reservation release is mandatory if the RELEASE(10) command is implemented. This command shallcause the device server to terminate all non-third-party logical unit reservations that are active from the initiator tothe specified logical unit.7.16.3 Third-party releaseThird-party reservation release is mandatory if the RELEASE(10) command is implemented. Third-party releaseallows an application client to release a logical unit that was previously reserved using third-party reservation (see7.21.3). Third-party release shall be implemented. It is intended for use in multiple-initiator systems that use theCOPY and EXTENDED COPY commands.If the third-party (3RDPTY) bit is zero, then a third-party release is not requested. If the 3RDPTY bit is zero then theLONGID bit and the PARAMETER LIST LENGTH field shall be ignored. If the 3RDPTY bit is one then the device servershall release the specified logical unit, but only if the initiator ID, 3RDPTY bit, and THIRD-PARTY DEVICE ID are identicalwhen compared to the RESERVE command that established the reservation.128 dpANS SCSI Primary Commands - 2 (SPC-2)
18 July 2001 T10/1236-D Revision 20If the 3RDPTY bit is one the device server shall not modify the mode parameters for commands received from thethird-party device even if the device server implements the transfer of mode parameters with a third-partyRESERVE command.NOTE 26 If a target implements independent storage of mode parameters for each initiator, a third-party RESERVEcommand copies the current mode parameters for the initiator that sent the RESERVE command to the currentmode parameters for the initiator specified as the third-party device (e.g., a copy manager SCSI device). A unitattention condition notifies the third-party of the changed mode parameters due to the reservation. A successfulthird-party RELEASE command does not change the third-party devices' current mode parameters back to theirprevious values. The third-party device may issue MODE SENSE and MODE SELECT commands to query andmodify the mode parameters.If the THIRD-PARTY DEVICE ID value associated with the reservation release is smaller than 255, the LONGID bit maybe zero and the ID value sent in the CDB THIRD-PARTY DEVICE ID field. Device ID formats are protocol specific. Ifthe LONGID bit is zero, the PARAMETER LIST LENGTH field shall be set to zero. If the THIRD-PARTY DEVICE ID is greaterthan 255, the LONGID bit shall be one.Device servers that support device IDs greater than 255 shall accept commands with LONGID equal to one. Deviceservers whose devices IDs are limited to 255 or smaller may reject commands with LONGID equal to one withCHECK CONDITION status and a sense key of ILLEGAL REQUEST.If the LONGID bit is one, the parameter list length shall be eight, and the parameter list shall have the format shownin table 95. If the LONGID bit is one, the THIRD-PARTY DEVICE ID field in the CDB shall be ignored. If the LONGID bitis one and the parameter list length is not eight, the device server shall return a CHECK CONDITION status with asense key of ILLEGAL REQUEST.Table 95 — RELEASE(10) parameter listBitByte077 6 5 4 3 2 1 0THIRD-PARTY DEVICE IDdpANS SCSI Primary Commands - 2 (SPC-2) 129
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