RELEASE UNIT
Table 70. Byte RELEASE UNIT Command
| 7 | 6 | 5 |
| 4 | 3 |
| 2 | 1 | 0 |
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0 |
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| Operation Code (17h) |
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1 | Logical Unit Number (0) |
| 3rdPty | Third Party Device ID (0) | Element | |||||
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2 |
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| Reservation Identification |
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3 |
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| Reserved |
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4 |
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| Allocation Length (0) |
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5 |
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| Control |
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Table 71. Byte Release Unit Command |
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| 7 | 6 | 5 |
| 4 | 3 |
| 2 | 1 | 0 |
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0 |
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| Operation Code (57h) |
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1 | Logical Unit Number (0) |
| 3rdPty (0) |
| LongID (0) | Reserved | ||||
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2 |
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| Reserved |
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3 |
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| Third Party Device ID (0) |
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4 |
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| Reserved |
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5 |
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| Reserved |
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6 |
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| Reserved |
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7 |
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8 |
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9 |
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| Control |
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The RELEASE UNIT command removes a reservation made by a RESERVE UNIT command. If there is an existing reservation from the same initiator with the same parameters, then that reservation is removed and Good status is returned. It is not an error to attempt to release a reservation that is not currently valid or is held by another initiator. In this case, the drive returns Good status without altering any reservation.
54Ultrium Internal Tape Drive and 3580 Ultrium Tape Drive: SCSI Reference
