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Re: Unique files



On Sun, Oct 26, 2014 at 4:20 PM, Colin Percival <cperciva@tarsnap.com> wrote:
On 10/26/14 06:52, jerry wrote:
> On 10/25/2014 12:21, Scott Robison wrote:
>> Is there a means to determine what is "new" between two "full"
>> archives? I do a full archive of an entire partition each day, and am
>> a little surprised by how much new data exists. I would like to "diff"
>
> *** Do you have the "noatime" option on your filesystem?  Without that, the
> filesystem will track, for each file, not only when it is modified, but
> when it is *read*.  So every read anywhere produces a write.  This is
> for Linux, I don't know if it holds for other OS's.

Tarsnap defaults to not storing file access times, so this shouldn't be
the issue (unless Scott is using the --store-atime option).

I am not using the --store-atime option, as I am only concerns with file contents, not metadata. I am using whatever default configuration exists in my Ubuntu 14.04 VPN with regard to updating atime, which appears to be "noatime" for all the mounts in fstab.

Thanks to all for the thoughts / info.

--
Scott Robison