Each Ceph OSD Daemon checks the heartbeat of other Ceph OSD Daemons every 6 seconds. You can change the heartbeat interval by adding an osd heartbeat interval setting under the [osd] section of your Ceph configuration file, or by setting the value at runtime. If a neighboring Ceph OSD Daemon doesn’t show a heartbeat within a 20 second grace period, the Ceph OSD Daemon may consider the neighboring Ceph OSD Daemon down and report it back to a Ceph Monitor, which will update the Ceph Cluster Map. You may change this grace period by adding an osd heartbeat grace setting under the [osd] section of your Ceph configuration file, or by setting the value at runtime.

By default, a Ceph OSD Daemon must report to the Ceph Monitors that another Ceph OSD Daemon is down three times before the Ceph Monitors acknowledge that the reported Ceph OSD Daemon is down. You can change the minimum number of osd down reports by adding the mon osd min down reports setting under the [mon] section of the Ceph configuration file, or by setting the value at runtime.

By default, only one Ceph OSD Daemon is required to report another Ceph OSD Daemon down. You can change the number of Ceph OSD Daemons required to report a Ceph OSD Daemon down to a Ceph Monitor by adding the mon osd min down reporters setting under the [mon] section of the Ceph configuration file, or by setting the value at runtime.

If a Ceph OSD Daemon cannot peer with any of the Ceph OSD Daemons defined in its Ceph configuration file or the cluster map, it will ping a Ceph Monitor for the most recent copy of the cluster map every 30 seconds. You can change the Ceph Monitor heartbeat interval by adding the osd mon heartbeat interval setting under the [osd] section of the Ceph configuration file, or by setting the value at runtime.

If an Ceph OSD Daemon does not report to a Ceph Monitor, the Ceph Monitor will consider the Ceph OSD Daemon down after the mon osd report timeout elapses. A Ceph OSD Daemon sends a report to a Ceph Monitor when a reportable event such as a failure, a change in placement group stats, a change in up_thru or when it boots within 5 seconds. You can change the Ceph OSD Daemon minimum report interval by adding the osd mon report interval min setting under the [osd] section of the Ceph configuration file, or by setting the value at runtime.

A Ceph OSD Daemon sends a report to a Ceph Monitor every 120 seconds irrespective of whether any notable changes occur. You can change the Ceph Monitor report interval by adding the osd mon report interval max setting under the [osd] section of the Ceph configuration file, or by setting the value at runtime.

When modifying heartbeat settings, include them in the [global] section of the Ceph configuration file.