> I recently purchased a Nakamichi MBR-7 7-disk CD-ROM reader/changer for
> general departmental use. From the DEC3000-300 firmware 6.2 console, the
> device appears as 7 LUN's at a particular SCSI target address, e.g.
> dka300-dka306. When I mount DEC Unix distribution CD's their presence and
> capacity is displayed. Not surprisingly the device cannot be used as a boot
> device. But I am hoping I can find information that will allow me to create
> device files that allow access to its CD-ROM magazine.
Thankyou for the many informative replies to:
alan_at_nabeth.cxo.dec.com
Selden E Ball Jr <SEB_at_LNS62.LNS.CORNELL.EDU>
"Paul E. Rockwell" <rockwell_at_rch.dec.com>
Nick Hill - RAL CISD Systems Group <NMH1_at_axprl1.rl.ac.uk>
golden_at_falcon.invincible.com
As is often the case with DEC Unix, the information was there if I'd only
known where to look for it ( see SCSI(7) man page ). However, after having
created the device files I still find that I can't mount disks from any of the
7 locations (LUN's). After checking back through my archive of
alpha-osf-managers messages, I find some references to problems with CD-ROM
players that have a block length of 2048 bytes rather than the standard 512
bytes. The following SCU utility output clearly confirms what I found in the
Nakamichi documentation -- the block length is 2048. Nakamichi tech support
told me that this value was not reconfigurable by any means.
The SCU output clearly proves that the CAM I/O system is communicating with
the LUN 0 device /dev/rrz3c. But if I can't reset the block length from 2048
to 512 bytes perhaps there is no way I can access the MBR-7 in any useful way.
Can anyone confirm that grim conclusion?
% scu -f /dev/rrz3c
scu> show device
Inquiry Information:
SCSI Bus ID: 0
SCSI Target ID: 3
SCSI Target LUN: 0
Peripheral Device Type: Read-Only Direct Access
Peripheral Qualifier: Peripheral Device Connected
Device Type Qualifier: 0
Removable Media: Yes
ANSI Version: SCSI-2 Compliant
ECMA Version: 0
ISO Version: 0
Response Data Format: CCS
Additional Length: 31
Vendor Identification: NRC
Product Identification: MBR-7
Firmware Revision Level: 110
scu> show edt
CAM Equipment Device Table (EDT) Information:
Bus: 0, Target: 0, Lun: 0, Device Type: Direct Access
Bus: 0, Target: 0, Lun: 1, Device Type: (not present)
Bus: 0, Target: 0, Lun: 2, Device Type: (not present)
Bus: 0, Target: 0, Lun: 3, Device Type: (not present)
Bus: 0, Target: 0, Lun: 4, Device Type: (not present)
Bus: 0, Target: 0, Lun: 5, Device Type: (not present)
Bus: 0, Target: 0, Lun: 6, Device Type: (not present)
Bus: 0, Target: 0, Lun: 7, Device Type: (not present)
Bus: 0, Target: 3, Lun: 0, Device Type: Read-Only Direct Access
Bus: 0, Target: 3, Lun: 1, Device Type: Read-Only Direct Access
Bus: 0, Target: 3, Lun: 2, Device Type: Read-Only Direct Access
Bus: 0, Target: 3, Lun: 3, Device Type: Read-Only Direct Access
Bus: 0, Target: 3, Lun: 4, Device Type: Read-Only Direct Access
Bus: 0, Target: 3, Lun: 5, Device Type: Read-Only Direct Access
Bus: 0, Target: 3, Lun: 6, Device Type: Read-Only Direct Access
Bus: 0, Target: 3, Lun: 7, Device Type: (not present)
scu> sh capacity
Disk Capacity Information:
Maximum Capacity: 61541
Block Length: 2048
scu> sh memory
The Controller Memory Size is 57344 (0xe000) bytes.
scu>
--
Brian Leverson, Systems Manager
University of Washington e-mail: brian_at_aa.washington.edu
Dept of Aeronautics and Astronautics phone: (206)543-6736
Box 352400 FAX: (206)543-0217
Seattle, WA 98195-2400
Received on Thu Jan 04 1996 - 02:43:13 NZDT