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Re: [Bug-tar] "file changed as we read it" on MacOS X

From: Bruno Haible
Subject: Re: [Bug-tar] "file changed as we read it" on MacOS X
Date: Sat, 24 Dec 2011 18:11:06 +0100
User-agent: KMail/1.13.6 (Linux/; KDE/4.6.0; x86_64; ; )

Paul Eggert wrote:
> On 12/23/11 22:57, Bruno Haible wrote:
> >   * It is possible that the MacOS X "Spotlight" indexer daemon and the
> >     MacOS X "Time Machine" incremental backup were running at the same time.
> Some programs like that play a trick: they save st_atime, then
> read a file, then restore st_atime back to the old value.  This
> updates st_ctime, though, and it might explain your problem.
> I don't know whether those two programs do that, though.

I don't know that either. But it would not explain why the effect happened
only on files in the 10 GB part that was accessed over NFS, not on the 80 GB
of data that was only accessed locally. Neither of these two daemons is
configured in a special way to exclude these 80 GB.


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