Can you list internal checksums of a ZFS filesystem?

[Steven Hartland]

----- Original Message ----- 
From: "CH" <freebsd-fs at ch.pkts.ca>
To: <freebsd-fs at 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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