Re: [chrony-users] Isolated time domains

[ Thread Index | Date Index | More Archives ]

On Tue, 3 Dec 2013, Tomalak Geret'kal wrote:

On 03/12/2013 00:58, Bill Unruh wrote:

> > In my test setup I have the master server's clock set back about 3 hours > and Chrony appears to be working great and is moving time towards what > is reported by the external NTP servers:

 Why? Is this a rediculous test? Why would you expect the master server to
 be 3
 hours out?

I typically find testing the potentially unexpected to be a fairly worthwhile use of my time, certainly in critical systems.

So, if for some reason your master were suddenly out by 3 hours, you would
want all of the clients to also be out by 3 hours, and to play catchup with
the master (the clients would all lag, depending on their poll intervals and
times because the master is racing along with a huge (>>500PPM) drift rate
trying to fix its own offset. Your scenario would have the clients far more
scattered in time than if they were all discplined to UTC all along.

What error scenario do youhave in mind where the master could suddenly find
itself out by 3 hours?


William G. Unruh   |  Canadian Institute for|     Tel: +1(604)822-3273
Physics&Astronomy  |     Advanced Research  |     Fax: +1(604)822-5324
UBC, Vancouver,BC  |   Program in Cosmology |     unruh@xxxxxxxxxxxxxx
Canada V6T 1Z1     |      and Gravity       |

To unsubscribe email chrony-users-request@xxxxxxxxxxxxxxxxxxxx with "unsubscribe" in the subject. For help email chrony-users-request@xxxxxxxxxxxxxxxxxxxx with "help" in the subject.
Trouble?  Email listmaster@xxxxxxxxxxxxxxxxxxxx.

Mail converted by MHonArc 2.6.19+