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Date:      Thu, 20 Jun 2002 09:25:17 +0930
From:      Greg 'groggy' Lehey <grog@FreeBSD.org>
To:        Randy Smith <randys@amigo.net>
Cc:        Paul Mather <paul@gromit.dlib.vt.edu>, freebsd-stable@freebsd.org
Subject:   Re: vinum question
Message-ID:  <20020619235517.GK29978@wantadilla.lemis.com>
In-Reply-To: <20020619101609.O6594-100000@stalker.amigo.net>
References:  <20020619160211.GA41355@gromit.dlib.vt.edu> <20020619101609.O6594-100000@stalker.amigo.net>

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On Wednesday, 19 June 2002 at 10:47:02 -0600, Randy Smith wrote:
> On Wed, 19 Jun 2002, Paul Mather wrote:
>
> # /dev/vinum/cgate:
> type: Vinum
> disk: vinum
> label: cgat
> flags:
> bytes/sector: 512
> sectors/track: 71601049
> tracks/cylinder: 1
> sectors/cylinder: 71601049
> cylinders: 1
> sectors/unit: 71601049
> rpm: 14400
> 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]
>   a: 71601049        0    4.2BSD     1024  8192     0   # (Cyl.    0 - 0)
>   b: 71601049        0      swap                        # (Cyl.    0 - 0)
>   c: 71601049        0    unused        0     0         # (Cyl.    0 - 0)
>
> I'm a little tired but it looks like 34 MB to me.

As it says in the man page, Vinum disk labels are fake.  They report
the same information that 'vinum list' reports.

> I ran newfs -v on it when I first created the volume on
> vinumdisk0. 

OK, that explains the size of the file system.  You have a 17GB file
system on a 34 GB volume.

> I didn't do it when I attached the second subdisk. (The volume has
> been in use a while and wiping the FS is not really an option.)

That's what growfs is for.

> vinum(8) says that "It is possible to increase the size of a
> concatenated vinum plex ..." so I would think that it could handle
> it. Maybe I'm wrong.

Vinum can handle it.  But Vinum just gives you a storage medium, it
doesn't change the data on that medium.

Greg
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