Date: Fri, 4 Oct 2002 09:33:28 -0500 From: Dan Nelson <dnelson@allantgroup.com> To: "Jacob S. Barrett" <jbarrett@amduat.net> Cc: freebsd-questions@FreeBSD.ORG Subject: Re: Block Zeroing Tool Message-ID: <20021004143328.GC21868@dan.emsphone.com> In-Reply-To: <3D9DA621.2080201@amduat.net> References: <3D9DA621.2080201@amduat.net>
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In the last episode (Oct 04), Jacob S. Barrett said: > Is there a tool for FreeBSD that zeros the unallocated blocks on a > filesystem? > > The company I work for has an image on demand system for our lab > machines. This system relies on ghost which only supports file by > file imaging on certain file systems. I want to take disk images of > certain FreeBSD installations. Ghost will only take sector by sector > images of FreeBSD partitions. Since it is doing this it stores all > the "junk" unused blocks as well. This makes for a very large image > even with high compression. If I can zero out the unused blocks > before taking the image with high compression the image size should > be much smaller. > > So, is there utility to zero out those blocks? Does this make sense? > Is there a better way to take images of FreeBSD machines? dd if=/dev/zero of=filler bs=1m ; rm filler -- Dan Nelson dnelson@allantgroup.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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