First the question, how does one change the rpm's on a non-disktab listed
drive? (Quantum XP34300 should be listed as 7200 but is listed as 3600, I
don't know if this will directly effect things, the drive seems to be
running fine I just don't want it to die because of an inproper setting)
Now for the summary:
Thanks out to:
Dan Gulkis <dgulkis_at_encore.com>
alan_at_nabeth.cxo.dec.com (Alan Rollow - Dr. File System's Home for Wayward
Inodes.) (Interesting title <g>)
olle_at_cb.uu.se (Olle Eriksson)
Both Dan and Olle recommended MAKEDEV's, and Alan went that extra mile
(thanks much) and explained in detail how to get it working (and other than
the rpm issue it seems to be working fine) Here is his recommendation
(original post is quoted):
>Exactly how does one get Digital Unix (3.2C running on a 1000 4/266) to see
>an externally connected SCSI drive?
Once you have drive correctly connected, the SCSI disk driver should
be able to see any SCSI-2 compliant disk without much additional
work. If you connected the disk with the system shutdown, use the
console to verify that you can see the disk. For most systems
the console "Show device" command is sufficient, if the external
bus is built-in. For add-on SCSI controllers you may need different
commands, so check the system documentation. Once the system console
can see the device, it virtually certain that the SCSI driver will
see the device when the system boots.
If you managed to add the device without shutting the system down
(possible and safe with StorageWorks bricks), then you can force
the SCSI driver to rescan the bus using the scu(8) command. The
command is:
# scu scan edt bus #
# scu show edt bus #
The tailing # should be filled in with the appropriate bus number.
V4.0 will scan all busses, if the "bus #" part is left off. The
2nd command will print what was found on the bus, so that you can
verify everything you expect is found.
>I have been poking around and found references to mknod and the
>like, but I always get confused about what the target for the
>drive is.
For disk and tape devices, it is best to use /dev/MAKEDEV. It
knows the rules for constructing the major and minor device
number that must be used with mknod. Since a typical disk will
have 16 devices (8 partitions, buffered and raw devices), it
is best to let MAKEDEV worry about the details. The argument
is the base device name. For SCSI disks this is "rz#", where
this "#" is found (bus-number * 8) + SCSI-id. The SCSI ID is
also the target number, which is the SCSI specification
term for it.
Once you have the special device files created, you should
use the disklabel command to label it. That will allow
customizing the partition table:
# disklabel -wr /dev/rrz#c disk-type
If the device is well behaved, it will puts it geometry
information in a set of mode pages that the host can
query. The disklabel command has an interface to this
feature and can get the geometry without the need for
disktab entry.
_____________________
Here is the disklabel generated for those who are interested:
type: SCSI
disk: RZxx
label:
flags: dynamic_geometry
bytes/sector: 512
sectors/track: 109
tracks/cylinder: 20
sectors/cylinder: 2180
cylinders: 3907
sectors/unit: 8399520
rpm: 3600
interleave: 1
trackskew: 0
cylinderskew: 0
headswitch: 0 # milliseconds
track-to-track seek: 0 # milliseconds
drivedata: 0
8 partitions:
# size offset fstype [fsize bsize cpg]
a: 131072 0 unused 0 0 # (Cyl. 0 - 60*)
b: 262144 131072 unused 0 0 # (Cyl. 60*- 180*)
c: 8399520 0 unused 0 0 # (Cyl. 0 - 3852*)
d: 0 0 unused 0 0 # (Cyl. 0 - -1)
e: 0 0 unused 0 0 # (Cyl. 0 - -1)
f: 0 0 unused 0 0 # (Cyl. 0 - -1)
g: 8006304 393216 4.2BSD 1024 8192 16 # (Cyl. 180*- 3852*)
h: 0 0 unused 0 0 # (Cyl. 0 - -1)
Thanks as always, this list is a godsend...
-Dave
___________________________________________________________________________
"Life feeds on life feeds on life... This is necessary!" -Tool
"Dole and Kemp, In God We Trust, Go To Church and Not to Hell" -Dole Sign
"For I am nothing, but my sin, Until I learn, to caste them in"
-Peter Murphy
___________________________________________________________________________
Dave C. Boyle
System Exorcist/Technical Director Media Access Systems, Inc.
PO Box 14917 makers of
Scottsdale, AZ 85267 Liquid Access, WICKEDFASTinternet
602.614.1884 917.381.0879 beeper 602.614.1872 fax
If you need to send me a beep drop mail to: beeper_at_liquidaccess.net
dboyle_at_liquidaccess.net
http://www.soho.net/soho/dave/index.html
___________________________________________________________________________
Received on Mon Sep 09 1996 - 08:31:21 NZST