On 23 Mar 2015, at 14:36, Mihai Moldovan wrote:

On 23.03.2015 07:27 PM, Christopher Jones wrote:
On 23 Mar 2015, at 6:24pm, Mihai Moldovan <[email protected]> wrote:
You likely rebooted yesterday or the like.

I haven't done so on a while, obviously…

yes, I did reboot around then yesterday. Perhaps I mis understood [Brandon]’s mail though but that seemed to suggest even a reboot wouldn’t update it. But if it does then fine, (non)mystery solved…

That's just a misunderstanding. The file is created/updated once
whenever Apple's ntpd starts, but never touched again afterwards (until
the next time Apple's ntpd is started.)

It's not a "once in a lifetime" deal.

So, his explanation fits beautifully.

I have a feeling that this has changed recently, perhaps as part of Apple's NTP security update. [1] On two of my machines, both running stock Apple code in this regard, /var/db/ntp.drift is changed between boots (it changed while I was looking at it just now on one machine). Also pacemaker is not running on either machine (it's disabled in launchctl). I don't know why my machines are different than yours, but it's not because of anything I intentionally changed. I see that ntpd on these machines is version 92.10.1 which is even later than in that security update. This was apparently part of 10.10.2. On one of the machines I looked at /usr/libexec/pacemaker was last accessed on Feb. 17 even though the machine was booted several times since then.

               Mike

[1] <https://support.apple.com/en-us/HT204425>
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