On 01/23/2014 04:16 PM, Brian Utterback wrote: > On 1/23/2014 8:06 AM, Marco Marongiu wrote: >> If you have just two references, the step 2) doesn't bring you anywhere >> as it is impossible to reach a majority. It's like you're skipping step >> 2), and the results lose accuracy. > > Not to put too fine a point on it, but if you have two servers and one > of them has the correct time and one is way off, with only two servers > the one that is far off is just as likely to be chosen as the correct > one. Worse still is you are subject to "clock hopping", where each of > the two servers are chosen alternately. Most news versions of NTP have a > certain amount of server "stickiness" built in to suppress clock > hopping, but it can still occur, especially if your servers reboot > frequently. Clock hopping can destabilize the frequency correction > feedback loop which in turn can lead to increasingly large clock > offsets. Not what you want.
Thanks for pointing out this Brian, it was not a detail. And it's often referred to with the sentence "a man with two clocks never knows what the time is" (or a similar sentence in correct English :) Ciao -- M _______________________________________________ questions mailing list [email protected] http://lists.ntp.org/listinfo/questions
