On 09/26/11 12:31, Nico Williams wrote:
> On Mon, Sep 26, 2011 at 1:55 PM, Jesus Cea <j...@jcea.es> wrote:
>> Should I disable "atime" to improve "zfs diff" performance? (most data
>> doesn't change, but "atime" of most files would change).
> atime has nothing to do with it.

based on my experiences with time-based snapshots and atime on a server which
had cron-driven file tree walks running every night, I can easily believe
atime has a lot to do with it - the atime updates associated with a tree walk
will mean that that much of a filesystem's metadata will diverge between the
writeable filesystem and its last snapshot.

                                        - Bill
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