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Date:      Sat, 27 Jan 2001 16:22:36 +1030
From:      Greg Lehey <grog@lemis.com>
To:        Alexey Koptsevich <ak@astro.ioffe.rssi.ru>
Cc:        questions@freebsd.org
Subject:   Re: vinum detach
Message-ID:  <20010127162236.N12091@wantadilla.lemis.com>
In-Reply-To: <Pine.BSF.4.21.0101270821300.86096-100000@astro.ioffe.rssi.ru>; from ak@astro.ioffe.rssi.ru on Sat, Jan 27, 2001 at 08:35:46AM %2B0300
References:  <20010127155028.M12091@wantadilla.lemis.com> <Pine.BSF.4.21.0101270821300.86096-100000@astro.ioffe.rssi.ru>

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On Saturday, 27 January 2001 at  8:35:46 +0300, Alexey Koptsevich wrote:
>
> Greg,
>
>> Presumably you're using the volume for a file system.  The newfs
>> program write the file system structure to the entire volume (or disk
>> partition), so even if the file system had no data at all in it, you
>> would damage it irreparably by removing a subdisk.
>
> But how is it possible to add new subdisks if file system structure is
> created for the entire volume?

There's a new program, growfs, which adjusts the size of the file
system.  It's available in -CURRENT only.

>> Why do you want to do this?
>
> I do not have resources to create several plexes but would like to
> be able to replace one of subdisks by other (of other size) if it
> fails by some reason. It is a pity I was mistaken.

You can use RAID-5 for this.  But you don't need detach to do it; it
will happen automatically if one drive fails.

Greg
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