OSD shows UP while it's not

[Gonzalo Aguilar Delgado <gaguilar.delgado@gmail.com>]

Hello, 

I found I cannot out down all my OSDs from the cluster.
root@blue-compute:/var/log# ceph osd tree
ID WEIGHT  TYPE NAME                 UP/DOWN REWEIGHT PRIMARY-AFFINITY 
-1 1.00000 root default                                                
-4 1.00000     rack rack-1                                             
-2 1.00000         host blue-compute                                   
 0 1.00000             osd.0            down        0          1.00000 
 2 1.00000             osd.2            down        0          1.00000 
-3 1.00000         host red-compute                                    
 1 1.00000             osd.1            down        0          1.00000 
 3 0.50000             osd.3              up        0          1.00000 
 4 1.00000             osd.4            down        0          1.00000 



    osdmap e2516: 5 osds: 1 up, 0 in; 153 remapped pgs



osd.3 up   out weight 0 up_from 2424 up_thru 2442 down_at 2423
last_clean_interval [2361,2420) 172.16.0.100:6806/4554
172.16.0.100:6807/4554 172.16.0.100:6808/4554 172.16.0.100:6809/4554
exists,up 8dd085d4-0b50-4c80-a0ca-c5bc4ad972f7


Everything is down. But 3 seems to be up. Why?

At OS level is also down.

root@red-compute:/var/log/ceph# ps ax | grep ceph
 1937 ?        Ssl    0:00 /usr/bin/ceph-mon -f --cluster ceph --id
red-compute --setuser ceph --setgroup ceph
27225 pts/0    S+     0:00 grep ceph


Why I cannot remove it?


Best regards,
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