From owner-freebsd-questions@FreeBSD.ORG  Thu Aug 18 11:22:50 2005
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Date: Thu, 18 Aug 2005 14:28:28 +0300
From: Giorgos Keramidas <keramida@ceid.upatras.gr>
To: Daniel Feenberg <feenberg@nber.org>
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References: <Pine.GSO.4.10.10508171553480.4409-100000@nber6.nber.org>
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Cc: Mohan Ramanujan <mohan@nber.org>, Alex Aminoff <aminoff@nber.org>,
	freebsd-questions@freebsd.org
Subject: Re: Making UFS snapshots
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On 2005-08-17 16:32, Daniel Feenberg <feenberg@nber.org> wrote:
>
> I notice on this list that Garance Drosehn
> <http://docs.FreeBSD.org/cgi/mid.cgi?p06230924bf1c752ccf7f> reports making
> a snapshot of a 4 gigabyte filesystem in less than one second. We have a
> 859 gigabyte filesystem and snapshots take about 75 minutes to complete.

Making a snapshot is not very slow if the disk is relatively idle at the
time.  Perhaps this is what's biting you?