O'Reilly logo

Learning Ceph - Second Edition by Karan Singh, Vaibhav Bhembre, Anthony D'Atri

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Time synchronization

Ceph demands that back-end servers, especially the MONs, have closely synchronized clocks. Ceph warns if the MONs experience greater than 50ms of time skew among themselves, though with modern tools sub-millisecond accuracy is quite achievable. The venerable ntpd time daemon still works, though the newer and legacy-free chrony provides stronger syncing and better accuracy. One can sync against internal corporate time sources including GPS-source appliances or from public servers. It is strongly advised to provision multiple, diverse time sources; the daemons will pool them periodically and select the best to sync against. The more sources one configures, the more tolerant the system is of connectivity glitches and external ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required