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.
A call to DEC support was discouraging. I already knew that this would not be
a supported boot device. The engineer said that the only DEC Unix 3.2C
multiple-LUN support was by specific applications, e.g. image scanner or RAID
disk software. The DEC RAID folks apparently provide manuals with the
purchase of DEC RAID that allow configuration of the device files for
multiple-LUN SCSI devices. But it was not made clear whether they were using
the existing SCSI driver or the correct 'mknod' parameters.
DEC Support Reply:
-----------------------------
"OSF" itself only supports LUN 0 disks, however, layered products,
applications, modifies scsi device driver for specific
LUN support.
for example, RAID disks are viewed as a LUN device.
And the Raid folks have "Manuals" on configuring these
devices.
Basically, say a device was dka302
scsi 0, target 3, lun 2
then it would be a
device disk rz3 at scsi0 drive 27
------------------------------
Is anyone aware of the correct 'mknod' parameters for multiple LUN devices or
is there no way to mount this device from DEC Unix?
--
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 Wed Jan 03 1996 - 00:05:59 NZDT