I have a little bit of experience with time (NTP) servers. When you run large enterprise systems it is essential all the systems mounting file systems from SAN & NAS refer to as accurate synchronisation as possible, otherwise checkpoints and milestones will not update with the metadata correctly. If a system mounting via samba or NFS for example starts to drift away from the server's time reference, it can lead to denial of service, race conditions and other sneaky corruption.
In my home network, I tend to run my own local NTP server for this function, which itself sources the time from one of the available Australian NTP servers. On the Mac desktops I point the time server to my local one, in earlier versions of MacOS I had to edit the .plist and NTP config files myself to ensure it used my choice. It is likely a permissions problem or just that 10.4 is getting a bit stale now! So, in the context of a large distributed network of interrelated servers relying on each other for services like file systems, then NTP accuracy becomes very important indeed. Imagine the fun that has been had recently in Parliament House regarding the Ashby affair, which all goes down to a couple of time stamps that have entered into the metadata for the documents supposedly erroneously because of a drifting NTP client. It does happen, and an inaccurate time service is obviously a wonderful source of plausible deniability, so yes.... - as accurate as possible ;) rachel -- rachel polanskis IT Consulting, UNIX & Macintosh Greater Western Sydney <[email protected]> > On 12 Nov 2014, at 12:21, Roger Clarke <[email protected]> wrote: > > My MacOSX 10.4.11 Date and Time tool has the 'Set date & time automatically' > option set, pointed at Apple Asia's server at time.asia.apple.com. > > I find it a serious concern that it doesn't work, and only synchs when I open > the panel. > > Having my clock run fast by c. 5 seconds per day is one thing. But there are > a lot of host devices around the place which would create far bigger problems > if they got significantly out of synch with authoritative time. > > What's the impression of Link Institute members about the frequency with > which hosts in professionally-run organisations synch with time-servers? > > A related question would be: what tolerance would be reasonable to expect > from date-time stamps compared with an authoritative time-server, e.g. > +/- 1 second? > +/- 5 seconds? > > -- > Roger Clarke http://www.rogerclarke.com/ > > Xamax Consultancy Pty Ltd 78 Sidaway St, Chapman ACT 2611 AUSTRALIA > Tel: +61 2 6288 6916 http://about.me/roger.clarke > mailto:[email protected] http://www.xamax.com.au/ > > Visiting Professor in the Faculty of Law University of N.S.W. > Visiting Professor in Computer Science Australian National University > _______________________________________________ > Link mailing list > [email protected] > http://mailman.anu.edu.au/mailman/listinfo/link _______________________________________________ Link mailing list [email protected] http://mailman.anu.edu.au/mailman/listinfo/link
