FSMLabs TimeKeeper

FSMlabs®  TimeKeeper is a plug-in solution that replaces OS-generated time with distributed time-keeping, locked to accurate reference sources. TimeKeeper helps IT managers distribute critical enterprise applications across clusters, data centers and wide-area networks, resulting in superior accuracy, increased performance and enhanced fault tolerance.

Note that while useful, these documents are very dated and performance has improved by orders of magnitude since.

Technical Summary

TimeKeeper Whitepaper