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Appendix G. Ceph Monitor and OSD configuration options

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

mon_osd_min_up_ratio
Description
The minimum ratio of up Ceph OSD Daemons before Ceph will mark Ceph OSD Daemons down.
Type
Double
Default
.3
mon_osd_min_in_ratio
Description
The minimum ratio of in Ceph OSD Daemons before Ceph will mark Ceph OSD Daemons out.
Type
Double
Default
0.75
mon_osd_laggy_halflife
Description
The number of seconds laggy estimates will decay.
Type
Integer
Default
60*60
mon_osd_laggy_weight
Description
The weight for new samples in laggy estimation decay.
Type
Double
Default
0.3
mon_osd_laggy_max_interval
Description
Maximum value of laggy_interval in laggy estimations (in seconds). The monitor uses an adaptive approach to evaluate the laggy_interval of a certain OSD. This value will be used to calculate the grace time for that OSD.
Type
Integer
Default
300
mon_osd_adjust_heartbeat_grace
Description
If set to true, Ceph will scale based on laggy estimations.
Type
Boolean
Default
true
mon_osd_adjust_down_out_interval
Description
If set to true, Ceph will scaled based on laggy estimations.
Type
Boolean
Default
true
mon_osd_auto_mark_in
Description
Ceph will mark any booting Ceph OSD Daemons as in the Ceph Storage Cluster.
Type
Boolean
Default
false
mon_osd_auto_mark_auto_out_in
Description
Ceph will mark booting Ceph OSD Daemons auto marked out of the Ceph Storage Cluster as in the cluster.
Type
Boolean
Default
true
mon_osd_auto_mark_new_in
Description
Ceph will mark booting new Ceph OSD Daemons as in the Ceph Storage Cluster.
Type
Boolean
Default
true
mon_osd_down_out_interval
Description
The number of seconds Ceph waits before marking a Ceph OSD Daemon down and out if it does not respond.
Type
32-bit Integer
Default
600
mon_osd_downout_subtree_limit
Description
The largest CRUSH unit type that Ceph will automatically mark out.
Type
String
Default
rack
mon_osd_reporter_subtree_level
Description
This setting defines the parent CRUSH unit type for the reporting OSDs. The OSDs send failure reports to the monitor if they find an unresponsive peer. The monitor may mark the reported OSD down and then out after a grace period.
Type
String
Default
host
mon_osd_report_timeout
Description
The grace period in seconds before declaring unresponsive Ceph OSD Daemons down.
Type
32-bit Integer
Default
900
mon_osd_min_down_reporters
Description
The minimum number of Ceph OSD Daemons required to report a down Ceph OSD Daemon.
Type
32-bit Integer
Default
2
osd_heartbeat_address
Description
An Ceph OSD Daemon’s network address for heartbeats.
Type
Address
Default
The host address.
osd_heartbeat_interval
Description
How often an Ceph OSD Daemon pings its peers (in seconds).
Type
32-bit Integer
Default
6
osd_heartbeat_grace
Description
The elapsed time when a Ceph OSD Daemon has not shown a heartbeat that the Ceph Storage Cluster considers it down.
Type
32-bit Integer
Default
20
osd_mon_heartbeat_interval
Description
How often the Ceph OSD Daemon pings a Ceph Monitor if it has no Ceph OSD Daemon peers.
Type
32-bit Integer
Default
30
osd_mon_report_interval_max
Description
The maximum time in seconds that a Ceph OSD Daemon can wait before it must report to a Ceph Monitor.
Type
32-bit Integer
Default
120
osd_mon_report_interval_min
Description
The minimum number of seconds a Ceph OSD Daemon may wait from startup or another reportable event before reporting to a Ceph Monitor.
Type
32-bit Integer
Default
5
Valid Range
Should be less than osd mon report interval max
osd_mon_ack_timeout
Description
The number of seconds to wait for a Ceph Monitor to acknowledge a request for statistics.
Type
32-bit Integer
Default
30
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