[jhart99]

Totally agree. A cheap GPS + Raspberry Pi makes an incredibly capable little NTP server capable of serving 100k clients(after you block the bad actors). The local network is down in the 10s of microseconds. Anything more accurate would need PTO and significantly more investment, but that is more accuracy than I'd ever need.

[LinuxBender]

Absolutely. Additional benefits on RasPi's is the lower power usage which makes the power capacity folks in the datacenter happy. They are also cheap enough every DC can have two of them so that application and system logs do not drift even if there is a prolonged network outage. There are PDU's that can switch between A and B side power for single power supply devices like these.