From owner-freebsd-questions  Wed Jan 17 12: 6:57 2001
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Date: Wed, 17 Jan 2001 12:11:13 -0800
From: Jaye Mathisen <mrcpu@internetcds.com>
To: questions@FreeBSD.ORG
Subject: Re: VN issues, 4.2-stable
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In-Reply-To: <20010117115728.B14550@apocalypse.cdsnet.net>; from mrcpu@internetcds.com on Wed, Jan 17, 2001 at 11:57:28AM -0800
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Found my own answer, from vm_swap.c

#define NSWAPDEV        4

Crap, crap, crap.  Oh well, another kernel, another reboot.


On Wed, Jan 17, 2001 at 11:57:28AM -0800, Jaye Mathisen wrote:
> 
> Color me stupefied, but vnconfig seems to use bizarre umasks to create
> files.
> 
> (Please cc replies to me, although I read -questions, I'm about
> 10000 messages behind. :))
> 
> 
> newsfeed-inn2# umask
> 22
> newsfeed-inn2# vnconfig -s labels -S 1g -T -Z -v -c vn0c swap1
> vnconfig: /dev/vn0c: Device not configured
> newsfeed-inn2# ls -l
> total 1049096
> --wx--xr--  1 root  wheel  1073741824 Jan 17 11:44 swap1
> 
> 
> Ignoring the bogus vn0c, which should've been  vn0.
> 
> 
> 
> Then:
> 
> after a little disklabeling:
> 
> newsfeed-inn2# disklabel -r vn0
> # /dev/vn0c:
> type: unknown
> disk: amnesiac
> label:
> flags:
> bytes/sector: 512
> sectors/track: 32
> tracks/cylinder: 64
> sectors/cylinder: 2048
> cylinders: 1024
> sectors/unit: 2097152
> 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 bps/cpg]
>   b:  2096128     1024      swap                        # (Cyl.    0*- 1023*)
>   c:  2097152        0    unused        0     0         # (Cyl.    0 - 1023)
> newsfeed-inn2# swapon /dev/vn0b
> swapon: /dev/vn0b: Invalid argument
> newsfeed-inn2# pstat -s
> Device          1K-blocks     Used    Avail Capacity  Type
> /dev/rad0s1b       262016      512   261504     0%    Interleaved
> /dev/rad1s1b       262016      504   261512     0%    Interleaved
> /dev/rad2s1b       262016      512   261504     0%    Interleaved
> /dev/rad3s1b       262016      440   261576     0%    Interleaved
> Total             1048064     1968  1046096     0%
> 
> 
> Basically, I have a need for about 2GB of temporary swap for a few hours, but ain't nothing I'm
> doing going to let me add it.  I do not have any other plain partitions that
> I can use at this time, just this vinum stripe.
> 
> I tried just swapon on the striped volume, get the same error.
> 
> Am I hitting some limitation in the number of swap devices or something?  Because
> "invalid argument" isn't much of a message.
> 
> 
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