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From: j@uriah.heep.sax.de (J Wunsch)
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Re: How to add a new SCSI drive?
Date: 23 Dec 1995 08:45:50 GMT
Organization: Private BSD site, Dresden
Lines: 51
Message-ID: <4bgfju$lij@uriah.heep.sax.de>
References: <4b8cik$40j@newsnewsnews> <4ba4fq$bls@uriah.heep.sax.de> <4bf3am$jd@tzlink.j51.com>
Reply-To: joerg_wunsch@uriah.heep.sax.de (Joerg Wunsch)
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lepslog@j51.com (Louis Epstein) writes:
> : You should
>
> : n e v e r
>
> : use the block device unless you're going to mount a file system.
>
> Hmmm...but would you add a disk without making any partitions?
Nope, but how's this related?
The actual partitioning is done by the disktab entry: traditionally,
the `c' partition covers the entire disk (or slice, if that matters),
the `b' partition is magic in that's reserved for a paging area. The
remaining partitions are freely usable, although partition `a' used to
be reserved for a (potential) root file system.
So you always have to make at least two partitions: `c', and one that
you're actually going to use. (Hmm, i think you could also newfs the
`c' partition, but that's not considered `good style'.)
So the minimum disktab entry looks like:
m2934s|Fujitsu M2934S:\
:ty=winchester:dt=SCSI:su#8506782:\ <<== capacity in sectors
:oc#0:pc#8506782:\
:oh#0:ph#8506782:th=4.2BSD:fh#1024:bh#8192:
It consists out of a single useable partition `h', covering the entire
disk (4153 MB).
The capacity in sectors (su# value) is what you see here:
(bt0:1:0): "FUJITSU M2934S-512 0110" type 0 fixed SCSI 2
sd1(bt0:1:0): Direct-Access 4153MB (8506782 512 byte sectors)
^^^^^^^
You don't necessarily need any sectors/track, cylinders etc. values,
just su# is sufficient.
Final word: there are several ideas on how to simplify this process.
But the above should work at least for every 2.0.5 or more recent
FreeBSD.
--
cheers, J"org
joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ -- NIC: JW11-RIPE
Never trust an operating system you don't have sources for. ;-)