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Chapter 5 SCSI Interface
General SCSI Bus Operation
52 Quantum|ATL PowerStor L200 Series Library User’s Guide
Data Transfer 5
The library supports asynchronous and synchronous data
transfers. The product has both differential and single-ended SCSI
interfaces. Odd parity is generated during all information transfer
phases where the device writes data to the SCSI bus, and checked
during all information transfer phases where data is read from the
bus.
During operations that take significant amounts of time, such as
Move Media commands, the device disconnects from the SCSI bus,
allowing other devices to access the bus. This disconnection is
configurable through the Disconnect-Reconnect Mode Parameters
page.
Initiator/Target
Operation
5
The library does not act as an initiator on the SCSI bus and will not:
• Generate unsolicited interrupts to the host
• Initiate its own SCSI commands
• Assert bus reset
SCSI IDs and
LUNs
5
The library always appears as logical unit number (LUN) LUN 0.
If the LUN specified in the Identify message is invalid, the library
will accept the Command Descriptor Block (CDB). There are three
cases in which this happens:
• If the command is Inquiry, the target will return the inquiry
data with the peripheral qualifier set to 011, indicating that the
target will never support the LUN in question.
• If the command is Request Sense, the target will return sense
data. The sense key will be Illegal Request, with an additional
sense code of Invalid LUN.
• For any other command, the target will terminate the
command with a Check Condition status, and generates the
sense data.
- User’s Guide 1
- Contents 3
- Glossary 87 7
- Index 93 7
- $XGLHQFH 13
- 1RWDWLRQDO 14
- &RQYHQWLRQV 14
- Overview 17
- Features 1 18
- Library Components 1 19
- Chapter 1 Overview 20
- Library Components 20
- Figure 1 OCP 20
- Library Door 1 21
- Back Panel 1 21
- Optional Bar Code 22
- Cartridge Handling 23
- Mechanism 23
- Tape Drive 1 24
- 6-Cartridge 25
- Magazine 25
- Element 26
- Numbering 26
- Convention 26
- Installing the Library 27
- Receiving the Library 2 30
- Rack Mount Kit 31
- Installation 31
- Connecting the Library 2 32
- Configuring the Library 2 35
- Configuring the Library 36
- Operator Control Panel 37
- OCP Functions 3 38
- Enable for Seq/SeqCirc 40
- (Requires V34+ 40
- Status 3 41
- Eject/Unlock 3 44
- SCSI ID 3 45
- AutoloadCart command 48
- Sequential or 48
- Sequential Circ 48
- Read Element 48
- Optional 50
- Autoclean Mode 50
- Information 3 51
- Code Update 3 52
- Table 10 Tests 53
- Enter button on 54
- Active or 54
- Using the Library 55
- Chapter 4 Using the Library 56
- Using the Library Door 56
- Figure 11 Slot 56
- Locations 56
- Opening the 57
- Library Door 57
- Closing the 57
- Using Tape Cartridges 4 58
- SDLT tape cartridge 59
- Write protect switch 59
- Removing a 60
- Cartridge 60
- Loading a 61
- Unloading a 62
- Using the Cleaning 62
- Handling and 63
- Storing Cleaning 63
- Cartridges 63
- Inserting the 65
- Removing the 66
- SCSI Interface 67
- Data Transfer 5 68
- Initiator/Target 68
- Operation 68
- SCSI IDs and 68
- Unit Attention 69
- Condition 69
- Behavior Around 69
- Power-On and 69
- SCSI Bus Reset 69
- SCSI Message System 5 70
- Chapter 5 SCSI Interface 71
- SCSI Message System 71
- Table 12 Status 71
- Bus Free 5 72
- Bus Parity Errors5 72
- Troubleshooting 73
- Guidelines 73
- Basic Library Operation 6 74
- Operation Failure 6 75
- Operation Failure 76
- Specifications 77
- Physical Specifications 1 78
- Performance Specifications 1 79
- Power Specifications 1 79
- Environmental Specifications 80
- Table 15 Environ 80
- Table 16 Operating 81
- Vibration 81
- Table 23 ESD Failure 86
- Level Limits 86
- Acoustic Noise Emissions 1 87
- Drive Reliability Factors 1 88
- Error Messages and 89
- Definitions 89
- Autoload Cart 90
- Scan Magazine, followed 93
- Preposition 96
- Regulatory Statements 97
- CISPR-22 98
- WARNING! 98
- ACHTUNG! 3 98
- ATTENTION! 3 98
- Laser Statement 3 100
- Battery Statement 3 101
- ATTENTION 3 102
- ACHTUNG 3 102
- Attenzione 3 102
- PRECAUCIÓN 3 102
- VARNING! 3 102
- Glossary 103
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