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Host synchronization
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).
chrony synchronize the system clock with NTP on specified servers with (ntp_primary_server and ntp_secondary_server).ptp4l synchronize the hardware clock (PHC) with PTP.phc2sys synchronize clocks (hardware and system)
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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.