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Automation/Device Interface (ADI)
There are two elements to the Automation/Device Interface (ADI):
•ADI Transport Protocol (ADT)—a standard protocol for communication between a SCSI automation device and a SCSI data transfer device, such as a tape drive.
The ADT protocol allows conforming ADI SCSI devices to inter-operate. The objectives of ADT are:
•To provide a low-cost interconnect method between an automation device and the data transfer devices that reside within the media changer.
•To standardize this interface so that different disk drives, tape drives, optical media drives, and other SCSI devices may be added to conforming media changers without requiring modifications to generic system hardware.
•To provide for the addition of special features and functions through the use of vendor-specific options.
The interface protocol includes provision for the connection of two SCSI ports. One of these ports is intended to be attached to a media changer device and may operate either as a SCSI initiator port or a SCSI initiator/target port. The other port is intended to be attached to a data transport type device (tape drive) and may operate as either a SCSI target port or SCSI initiator/target port. No provision is made for connection of more than two ports.
•ADI Commands (ADC-2)—an extension to the SCSI command set for communication with application clients through the ADI.
The objectives of ADC-2 are:
•To permit an application client to communicate over a SCSI service delivery subsystem, with a logical unit that declares itself to be an ADI device in the Peripheral Device Type field of the standard INQUIRY data.
•To define commands unique to the ADI device type.
•To define commands and parameters to manage the operation of the ADI device type and the operation of logical units of other specific device types that are present in the same device as the ADI logical unit.
For details of HP’s implementation of these standards, see the HP ADI Firmware Integration Guide. The T10 standards referenced by this guide are as follows:
•ADT: ANSI INCITS 406-2005
•ADC-2: T10/1741-D revision 7d.
36 Supporting Ultrium features
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Contents
volume 2 software integration
LTO 4 FC, SCSI and SAS drives
HP LTO Ultrium tape drives technical reference manual
HP restricted
Legal and notice information
Contents
1 Designing backup applications
2 Configuration and initialization
3 Use of tapes
5 Supporting Ultrium features
4 Factors affecting performance
6 Sense keys and codes
7 Exception handling
HP restricted
Related documents
Documentation map
Documents specific to HP Ultrium drives
Drives-general
Installation and configuration
Operation
Cartridges
Interface
Maintenance and troubleshooting
Dealing with errors
LTO Ultrium features
General documents and standardization
1 Designing backup applications
Non-immediate commands
Optimizing performance
Large data transfer size
Cleaning tape heads
Managing the use of tapes
Information in Cartridge Memory
Monitoring tape use
Design goals for LTO backup applications
Diagnostic logs
TapeAlert
Displaying drive information
Include the capability to download firmware
2 Configuration and initialization
Inquiry string recovery
Operating system drivers
Example
16 Configuration and initialization
SCSI protocol, regardless of transport or interface type
Support for additional LUN
Enabling additional LUN support
Supporting additional LUNs
18 Configuration and initialization
Using Cartridge Memory attributes
Using MODE SENSE
3 Use of tapes
LTO cartridge memory
Tape status and capacity
Finding the remaining capacity
Interpreting Log Sense data
Using the SET CAPACITY command
Command descriptor block
CDB fields
Changes to SCSI commands
WORM media
How WORM media works
New additional sense codes and TapeAlert flags
Error Usage page
ERASE commands rejected
SET CAPACITY command
Re-writing media labels
Using CM to check tape integrity
Behavior with a missing or inconsistent EOD value
Unique media identifier
Responding to Cartridge Memory data
Load count
Barcode support
RWW retry counts
Corrective action
4 Factors affecting performance
Ways of optimizing performance
Detecting the drive’s speed
Ensuring the recommended minimum transfer sizes
Using Cartridge Memory instead of tape headers
Using the Performance Log page for diagnosing problems
Time-out values
Media type identification
Recommended support of log pages
Factors affecting performance
Host-related factors
Example
Recommendation
where possible or a reasonably sized RAID system. More disks means
makes sense to split heavily used FC cards across separate PCI busses
Drive-related factors
Do not interleave write commands with other commands, such as READ
Format-related factors
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34 Factors affecting performance
5 Supporting Ultrium features
Cartridge Memory LTO-CM
Automation interface
Further information
Automation/Device Interface ADI
Automation Control Interface ACI
Modes of usage through ACI
Slave to a library controller
ACI command set
ACI commands that affect drive streaming performance
SCSI pass-through mode
New features in ACI
Backward compatibility
SCSI command
Encryption support
Further details
Supporting the ACI protocol
Recommended ACI time-out values
42 Supporting Ultrium features
Recommended power-up sequence
Treatment of reserved fields
Recommended load-unload configuration
Firmware upgrade via tape
Recommended Get Drive Status polling frequency
ACI protocol communications retry
Upgrading the drive firmware
Firmware upgrade via the primary host interface
Firmware upgrade via ACI
Library firmware upgrade via tape
Handling irregular cartridges
Cleaning cartridge HP-configured or Universal
Expired cleaning cartridge HP-configured or Universal
Non-HP Ultrium 1 cleaning cartridge
Unreadable data cartridge
Valid firmware upgrade cartridge
Data cartridge with unreadable CM
Cartridge fails to seat or load
Cartridge cannot be loaded
Frequently asked questions
Cleaning
Invalid firmware upgrade cartridge
Is there separate firmware for drives intended to go into libraries?
Backup software
Resetting drives
Resetting via the ACI Reset command
Resetting using the ACIRSTL line
Accessing Cartridge Memory without threading the tape
Controlling data compression
Other mode page information
Buffer size at EW-EOM
Rewind on reset
Write delay time
Partition size
52 Supporting Ultrium features
6 Sense keys and codes
Sense keys-actions to take
Action
Console Message
“3h-MEDIUM ERROR” on page 62 . Also see the Media Access
For additional sense codes, see “3h-MEDIUM ERROR” on
log the error, terminate I/O to the drive, and pass the appropriate
error to the calling application
Action
Console Message
Action
Console Message
page
Additional sense codes-actions to take
Physical
End-of-Tape
reached, unable to fit
0h-NO SENSE
1h-RECOVERED ERROR
2h-NOT READY
The software must issue a LOAD before media access
LUN not accessible, port in
The command cannot be executed because the specified
60 Sense keys and codes
mechanism tests are being executed. When the tests are
3h-MEDIUM ERROR
A READ , SPACE , WRITE or WRITE FILEMARKS command
62 Sense keys and codes
Send a console message that an unrecovered error on
and the drive. Based on this, ask the user to clean the
64 Sense keys and codes
Send a message to the console indicating that there is
The current command such as READ, SPACE, REWIND
66 Sense keys and codes
4h-HW ERROR
5h-ILLEGAL REQUEST
A MODE SELECT parameter list sent to the drive contains
68 Sense keys and codes
6h-UNIT ATTENTION
persistent reservation using the PERSISTENT RESERVE OUT
allowed to execute. In other words, some commands can
32 initiators to register, using PERSISTENT RESERVE OUT
Action
service action removed all reservations and the persistent
A PERSISTENT RESERVE OUT command was executed
WRITE BUFFER or MAINTENANCE OUT command
A SET DEVICE IDENTIFIER command has been successful
7h-DATA PROTECTION
Code
8h-BLANK CHECK
Bh-ABORTED COMMAND
READ BUFFER command
related to a missing EOD data set. The most likely cause
Dh-VOLUME OVERFLOW
A WRITE or WRITE FILEMARKS command has encountered
76 Sense keys and codes
Typical escalation procedure
1. Retrieve fault information
3. Allow the user to try recovery
4. Allow the user to reset devices
Monitoring the condition of the drive and media
Supporting TapeAlert
Flags
Type
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Designing software to use the TapeAlert log
TapeAlert models
Reading the TapeAlert log
TapeAlert polling usage model
TapeAlert informational exception usage model
One-Button Disaster Recovery OBDR
Responding to the ‘Clean’ LED
Supporting OBDR
Providing pass-through mode
Requirements for drivers and logical device managers
Glossary
see ”read-while-write”
Index
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