AIX 7.1 Introduces NTP version 4

AIX 7.1 now includes support for NTP version 4 which is far more accurate than previous versions.

To check which version is active examine the symbolic link:

If you are using version 3 you should see:

# ls -l /usr/sbin/xntpd
lrwxrwxrwx    1 root     system           20 Apr 11 11:49 /usr/sbin/xntpd -> /usr/sbin/ntp3/xntpd

If you are using version 4 you should see:

# ls -l /usr/sbin/xntpd
lrwxrwxrwx    1 root     system           20 Apr 11 11:49 /usr/sbin/xntpd -> /usr/sbin/ntp4/xntpd

Eac version of NTP is meant to be backwards compatible however you should always do extensive testing before relying on this in production.