##################################osd heartbeat interval = 0############################
Unable to perform Ceph OSD Heartbeat Operation (Thread::osd_srv_heartbt), while "osd heartbeat interval" is set to 0.
[root@ceph-server ~]# ceph osd tree
ID WEIGHT  TYPE NAME            UP/DOWN REWEIGHT PRIMARY-AFFINITY
-1 3.00000 root default
-2 3.00000     host ceph-server
 0 1.00000         osd.0             up  1.00000          1.00000
 1 1.00000         osd.1           down        0          1.00000
 2 1.00000         osd.2           down        0          1.00000
[root@ceph-server ~]# ceph health
HEALTH_ERR 323 pgs are stuck inactive for more than 300 seconds; 4 pgs degraded; 42 pgs peering; 281 pgs stale; 4 pgs stuck degraded; 42 pgs stuck inactive; 281 pgs stuck stale; 46 pgs stuck unclean; 4 pgs stuck undersized; 4 pgs undersized; recovery 10/2174 objects degraded (0.460%); too many PGs per OSD (597 > max 300)
[root@ceph-server ~]#
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osd_srv_heartbt
osd_heartbeat_interval


Perform Ceph OSD Heartbeat Operation continuously without any delay, while "osd heartbeat interval" is set to any negative value.

##################################osd heartbeat interval = -1############################
Perform Ceph OSD Heartbeat Operation (Thread::osd_srv_heartbt) continuously without any delay, while "osd heartbeat interval" is set to any negative value (-1 is set here)
[root@ceph-server ~]# ceph osd tree
ID WEIGHT  TYPE NAME            UP/DOWN REWEIGHT PRIMARY-AFFINITY
-1 3.00000 root default
-2 3.00000     host ceph-server
 0 1.00000         osd.0             up  1.00000          1.00000
 1 1.00000         osd.1             up  1.00000          1.00000
 2 1.00000         osd.2             up  1.00000          1.00000
[root@ceph-server ~]# ceph health
HEALTH_OK
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