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Date: Fri, 29 May 2009 15:02:48 +0200 (CEST)
From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
To: Mike Barnard <mike.barnardq@gmail.com>
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Cc: FreeBSD Questions <freebsd-questions@freebsd.org>
Subject: Re: Growing a ZFS file system
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>
> I have a zfs pool of about 700GB, on it, i have a file system, home, mounted
> on /home and its 200GB. The file system has reached 100% capacity and im in

zfs doesn't have static allocation of space for subfilesystems at all!

you just have set a quota

RTFM - to be exact
man zfs