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 1
SCSI Command Support
Device Model
Quantum intelligent libraries support both a media changer device (device type 08h) and, depending on the
library model and configuration, a controller device (device type 0Ch). The controller device is used primarily
to aid initialization and discovery for the servers in conjunction with the library’s Logical Library model. In
the case of a Scalar i40 and Scalar i80, which do not support Data Appliance (DA) blades, or Scalar i500
and Scalar i6000 libraries without DA blades, there is no controller device. In such configurations, tape
drives host the library control path to the logical library partitions and hereby provide access to the media
changer devices.
This device model approach works by having the controller device (typically at LUN 0) respond to
commands directed at LUN 0, including the REPORT LUNS command, and the media changer device(s)
(one media changer device per logical library partition) typically respond to commands on LUN1. This
approach allows an initiator (host) to issue a REPORT LUNS command to the controller device to retrieve
a listing of all available logical units, to determine the presence of connected Data Transfer Device(s) and
media changer device(s). For systems with FC ports, this is an advantage as there are large number of
possible logical units to search. (In the case of a Scalar i40, and Scalar i80, or Scalar i500 and Scalar i6000
without DA blades, this command should be issued to the tape drives.)
Note that the DA blade controller device is not a pure controller device, in that it does not support all the
mandatory commands defined by SCC. This is an accepted industry practice established by vendors of
bridges and routers.
Note
“DA blade” is a generic term used in this manual to describe a
Fibre Channel (FC)-to-FC I/O blade.