User's Guide
Table Of Contents
- SCSI Command Support
- SCSI Commands
- Initialize Element Status - 07h
- Initialize Element Status With Range - E7h
- Inquiry - 12h
- Log Sense - 4Dh
- Mode Select (6) - 15h
- Mode Select (10) - 55h
- Mode Sense (6) - 1Ah
- Mode Sense (10) - 5Ah
- Mode Pages
- Move Medium – A5h
- Persistent Reserve In – 5Eh
- Persistent Reserve Out – 5Fh
- Position to Element – 2Bh
- Prevent Allow Medium Removal – 1Eh
- Read Buffer – 3Ch
- Read Element Status – B8h
- Release Element (6) – 17h
- Release Element (10) – 57h
- Report LUNS – A0h
- Request Sense – 03h
- Request Volume Element Address - B5h
- Reserve Element (6) - 16h
- Reserve Element (10) - 56h
- Send Diagnostic - 1Dh
- Send Volume Tag - B6h
- Test Unit Ready (00h)
- Write Buffer (3Bh)
Quantum Scalar Intelligent Libraries SCSI Reference Guide Guide 7
Reserved Fields
Reserved fields are not checked, and no error will be sent if they contain non-zero values.
Vendor Specific Fields
Vendor Specific fields are not checked and no error will be sent if they contain non-zero values, unless
specific uses are defined within a SCSI command and vendor specific settings are required.
Online/Offline Operation
Each media changer device can be placed in either an online or offline mode. The purpose of these modes
is to configure whether the media changer device is being controlled by a SCSI initiator or by the local or
remote user interface. When the media changer device is online, a SCSI initiator is controlling it and all SCSI
commands are supported. When the media changer device is offline, the local or remote user interface is
controlling it, and the only allowed SCSI commands are
• INQUIRY
•REPORT LUNS
• REQUEST SENSE
• TEST UNIT READY
• MODE SENSE (page 1Dh)
All other commands will respond with a check condition, along with an ASC/ASCQ of 04/8Dh (Logical unit
offline) or 04/12h (Logical unit not ready, offline). The READ ELEMENT STATUS command is allowed with
DVCID=1, VOLTAG=0 while the library is offline or the main door is open.
Note: If the SCSI media changer device is configured via a library control path-enabled tape drive,
RESERVE and RELEASE commands are also accepted and handled when the library is reporting offline
status.
The DA blade controller device SCSI command set is not affected by the online/offline mode of the media
changer device.
Supported Interfaces
The library supports parallel SCSI, SAS and Fibre Channel interface types, supporting parallel SCSI and
Fibre Channel interfaces as described below.
Parallel SCSI Interface Support
The library supports parity checking on the parallel SCSI interface. It will attempt to retry when parity errors
are detected, but if unsuccessful will attempt to respond with a Check Condition indicating in which phase
the parity error was detected.
If permitted by the initiator, the library will also support SCSI disconnect for commands that take a lengthy
time to process, such as MOVE MEDIUM. Disconnect privilege is granted by the initiator via the Identify
message.