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In-Reply-To: <357BBECD.CD9B7850@chalmers.com.au>
Date: Mon, 08 Jun 1998 19:49:05 +0200 (CEST)
Reply-To: malte@webmore.com
From: Malte Lance <malte@webmore.com>
To: Robert Chalmers <robert@chalmers.com.au>
Subject: RE: Conclusion: disktab software is RS.
Cc: freebsd-questions <freebsd-questions@FreeBSD.ORG>
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Robert,
first of all: Do you really want a dedicated FreeBSD-disk or
do you want one or more partitions on this disk and then
disklabel this partitions ?

In the latter case, build your partitions on the disk with fdisk.
Then disklabel the partitions "disklabel -r -w sd1s<n> ... "
where <n> is the partition-number you want to disklabel.
Consider :se#512:nt#64:ns#32: as geometry-setting for partitioning
and disklabel'ing. Maybe you don't get all the sectors on the disk
with this geometry, but who cares. You'll miss < 1 MB !!!

Malte.

On 08-Jun-98 Robert Chalmers wrote:
> To take this back to scratch, the command
> 
>    disklabel -r -w sd1 auto
> 
> produces this for a disklabel on sd1;
> 
># /dev/rsd1c:
> type: unknown
> disk: 
> label: 
> flags:
> bytes/sector: 512
> sectors/track: 86
> tracks/cylinder: 18
> sectors/cylinder: 1548
> cylinders: 2655
> sectors/unit: 4110000
> rpm: 3600
> interleave: 1
> trackskew: 0
> cylinderskew: 0
> headswitch: 0         # milliseconds
> track-to-track seek: 0        # milliseconds
> drivedata: 0 
> 
> 3 partitions:
>#        size   offset    fstype   [fsize bsize bps/cpg]
>   c:  4110000        0    unused        0     0               # (Cyl.    0 -
2655*)
> 
> Now, the formula, sects/track * tracks/cylinder * number of cylinders for
> this
> produces a size of 4109940, which is clearly different to the 4110000 shown
> for
> partition c:  It seems to have been rounded up?
> 
> Now, no matter what I do with the numbers, a disktab for this will not work.
> However, a disklabel and edit the table directly does. I can only conclude
> that
> there is someing wrong with the disktab part of the whole process.
> 
> bob
> -- 
>   Support Whirled Peas.       Business in China?    China House
>   robert@chalmers.com.au      ph:61 7 49440357 fx:61 7 49578425 
>    China House Uses Webposition to ensure Top Spot in Searches      
>    http://www.chalmers.com.au/ChinaHouse/Business/webposition
> 
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----------------------------------
E-Mail: Malte Lance <malte@webmore.com>
Date: 08-Jun-98
Time: 19:31:56
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