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doc: improve description of refclock tai option

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Emphasize that tzdata must be kept up to date in order for the
correction to work as expected.
This commit is contained in:
Miroslav Lichvar 2018-02-15 16:47:41 +01:00
parent bfc2fa645c
commit 0bc112f8b4
1 changed files with 5 additions and 6 deletions
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11
doc/chrony.conf.adoc
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@ -550,12 +550,11 @@ unauthenticated NTP sources in order to improve the accuracy of the clock. They
can be selected and used for synchronisation only if they agree with the
trusted and required source.
*tai*:::
This option indicates that the time on the given reference clock is kept in TAI
instead of UTC and that *chronyd* should apply the current TAI-UTC offset to
samples taken from this refclock. To use this, the *leapsectz* directive must
be used as *chronyd* uses the timezone files to compute the TAI-UTC offset.
This option does not make sense if the given refclock is only being used for
PPS input.
This option indicates that the reference clock keeps time in TAI instead of UTC
and that *chronyd* should correct its offset by the current TAI-UTC offset. The
<<leapsectz,*leapsectz*>> directive must be used with this option and the
database must be kept up to date in order for this correction to work as
expected. This option does not make sense with PPS refclocks.
*minsamples* _samples_:::
Set the minimum number of samples kept for this source. This overrides the
<<minsamples,*minsamples*>> directive.