The hosts will be charge to synchronize the time both with NTP and PTP with
timemaster. It's configured during the network (see Network architecture section).
chronysynchronize the system clock with NTP on specified servers with (
ptp4lsynchronize the hardware clock (PHC) with PTP.
phc2syssynchronize clocks (hardware and system).
With PTP, the system will have a better precision. So, in the cluster, all hosts will be on the same time. It's important when hosts want to add resource in the shared storage.
All guests should have modules to load by default:
ptp_kvm: Use for high precision time sync between host and guest.