Date: Tue, 17 Jul 2012 23:54:38 +0100 From: "Steven Hartland" <killing@multiplay.co.uk> To: "CH" <freebsd-fs@ch.pkts.ca>, <freebsd-fs@freebsd.org> Subject: Re: Can you list internal checksums of a ZFS filesystem? Message-ID: <451BA6FA76214F37B2F271F91708E275@multiplay.co.uk> References: <20120717152629.42e0641e@fedora14-x86-64.shechinah.mi.microbiology.ubc.ca>
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----- Original Message -----
From: "CH" <freebsd-fs@ch.pkts.ca>
To: <freebsd-fs@freebsd.org>
Sent: Tuesday, July 17, 2012 11:26 PM
Subject: Can you list internal checksums of a ZFS filesystem?
> Hello list,
>
> I'm moving data to a ZFS filesystem, and it's a ton of big files (more
> than 3 terabytes). I don't trust the network copy command completely,
> and so I'd like to compare checksums. I'm not looking forward to it,
> since it's going to be a slow process, especially if I can't run the
> command on the server.
>
> Since ZFS already has computed and stored checksums for every file on
> the destination machine, is there an easy way to extract that from the
> filesystem? Perhaps 'ls -lR --checksums' or similar?
>
> Note, checksums still have to be calculated on the source machine, and
> so the overall operation will still take the same length of time
> (assuming ZFS is faster than HFS+), but it does save a lot of cpu and
> disk reads on the destination machine, which can then be used for other
> things.
IIRC its block level checksums, not file level ones so don't think this
will be what your looking for.
Regards
Steve
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