Re: Hi,a little question about DP2.

[kai ouyang]

Dear smkelly,

From: Sean Kelly <[EMAIL PROTECTED]>
To: kai ouyang <[EMAIL PROTECTED]>
CC: [EMAIL PROTECTED]
Subject: Re: Hi,a little question about DP2.
Date: Tue, 19 Nov 2002 21:07:49 -0600

On Wed, Nov 20, 2002 at 10:29:16AM +0800, kai ouyang wrote:

You can't `mknod` any device in /dev that isn't known to devfs. Devices

are

name-based now:

edgemaster# ls -l cuaa0
crw-rw---- 1 uucp dialer 28, 128 Nov 18 14:13 cuaa0
edgemaster# mknod newdevice c 28 128
mknod: newdevice: No such file or directory

`mknod` is obsoleted for /dev when using devfs, as the device entries are
created and destroyed dynamically as devices are detected and removed from
the system.

If you accidentally delete a device and aren't sure what the major/minor

of

it was to recreate it, try something like this:

edgemaster# rm cuaa0
edgemaster# ls -l cuaa0
ls: cuaa0: No such file or directory
edgemaster# devfs rule apply path cuaa0 unhide
edgemaster# ls -l cuaa0
crw-rw----  1 uucp  dialer   28, 128 Nov 18 14:13 cuaa0

Woo, thank you.
you mean that I couldn't create device manually when using DEVFS?

Actually it is the 'c' slice that is generally used to indicate the whole
disk. This is still the case in 5.0. However, I am unable to tell you what
'd' used to represent. I am also clueless on this particular detail.

Hope that helps.

I think 'c' partition represents the slice total size rather than the whole
disk size. The follow is my DP2 default partition info
# size offset fstype [fsize bsize bps/cpg]
a: 262144 63 4.2BSD 2048 16384 16392 # (Cyl. 0*- 16*)
b: 477792 262207 swap # (Cyl. 16*- 46*)
c: 14329917 63 unused 0 0 # (Cyl. 0*- 891*)
d: 524288 739999 4.2BSD 2048 16384 32776 # (Cyl. 46*- 78*)
e: 524288 1264287 4.2BSD 2048 16384 32776 # (Cyl. 78*- 111*)
f: 12541405 1788575 4.2BSD 2048 16384 28512 # (Cyl. 111*- 891*)
cylinders/unit 0
Warning, partition c doesn't start at 0!
Warning, partition c doesn't cover the whole unit!
Warning, An incorrect partition c may cause problems for standard system utilities

I don't know why the 'c' partition doesn't start at 0.
It is strange.

--
Sean Kelly         | PGP KeyID: 77042C7B
[EMAIL PROTECTED] | http://www.zombie.org

Thank you!
Best Regards
Ouyang Kai

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