Hello Community
Need your help in understanding this.
I have the below node, which is hosting 60 physical disks, running 1 OSD per disk so total 60 Ceph OSD daemons
[root@node01 ~]# service ceph status | grep -i osd | grep -i running | wc -l
60
[root@node01 ~]#
However if i check OSD processes it shows that there are 120 OSD process are running.
[root@node01 ~]# ps -ef | grep -i osd | grep -v grep | wc -l
120
[root@node01 ~]#
Question 1 : why its 120 processes ? , i it should be 60 (because of 60 OSD on the system)
My guess : is this because of multithreading ?
Now if i check the number of ports used by OSD its comming out to be 240
[root@node01 ~]# netstat -plunt | grep -i osd | wc -l
240
[root@node01 ~]#
Question 2 : Now why its 240 ports ? It should be 60 ( because of 60 OSD on the system)
If i grep a specific OSD port , its shows 2 ports are occupied by OSD process 260519
[root@node01 ~]# netstat -plunt | grep -i osd | grep -i 6819
tcp 0 0 10.101.50.1:6819 0.0.0.0:* LISTEN 260519/ceph-osd
tcp 0 0 10.102.50.1:6819 0.0.0.0:* LISTEN 260519/ceph-osd
[root@node01 ~]#
Question 3 : Now based on the scenario 2 it should be 4 ( so 60 OSD x 4 ports = 240 ports in total)
I have two public and cluster network configured in ceph.conf , is all these because of two different networks ?
I would really appreciate if some knowledgeable person share his understanding with me.
Thank you in advance.
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