How to Enable Slewing Option of NTP Service in AIX

To enable slew mode on NTP service of AIX, you should enable both boot-time slewing mode and run-time slewing mode.

Enable at Boot-Time

We configure xntpd service in /etc/rc.tcpip with "-x" option so as to enable slew mode on a reboot.

[root@primary01 /]# vi /etc/rc.tcpip
...
# Start up Network Time Protocol (NTP) daemon
start /usr/sbin/xntpd "$src_running" "-x"

Make sure you add "-x" to enable slewing option.

[root@primary01 /]# grep xntpd /etc/rc.tcpip
start /usr/sbin/xntpd "$src_running" "-x"

By doing this, we can prevent PRVG-1036 and pass the pre-installation check of Oracle software 19c installation.

Enable at Run-Time

Configure NTP service.

[root@primary01 /]# vi /etc/ntp.conf

#broadcastclient
slewalways yes
server 10.1.2.100 prefer
...

Change service attribute.

[root@primary01 /]# chssys -s xntpd -a "-x"
0513-077 Subsystem has been changed.

Restart NTP daemon.

[root@primary01 /]# stopsrc -s xntpd
0513-044 The /usr/sbin/xntpd Subsystem was requested to stop.
[root@primary01 /]# startsrc -s xntpd
0513-059 The xntpd Subsystem has been started. Subsystem PID is 55705898.

Check service process.

[root@primary01 /]# ps -ef | grep xntpd | grep -v grep
    root 55705898  6357482   0 18:59:31      -  0:00 /usr/sbin/xntpd -x

By doing this, we can prevent PRVG-1032 and pass the pre-installation check of Oracle software 19c installation.

Done!