What is "up:standby"? in ceph mds stat => e5: 1/1/1 up {0=ceph-test-3=up:active}, 2 up:standby

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Hi,

I have installed mdss role with Ansible.

Now, I have this:

root@ceph-test-1:/home/vagrant# ceph fs ls
name: cephfs, metadata pool: cephfs_metadata, data pools: [cephfs_data ]
root@ceph-test-1:/home/vagrant# ceph mds stat
e5: 1/1/1 up {0=ceph-test-3=up:active}, 2 up:standby
root@ceph-test-1:/home/vagrant# ceph status
    cluster 7ecb6ebd-2e7a-44c3-bf0d-ff8d193e03ac
     health HEALTH_OK
     monmap e1: 3 mons at {ceph-test-1=172.28.128.3:6789/0,ceph-test-2=172.28.128.4:6789/0,ceph-test-3=172.28.128.5:6789/0}
            election epoch 10, quorum 0,1,2 ceph-test-1,ceph-test-2,ceph-test-3
      fsmap e5: 1/1/1 up {0=ceph-test-3=up:active}, 2 up:standby
     osdmap e14: 3 osds: 3 up, 3 in
            flags sortbitwise,require_jewel_osds
      pgmap v36: 164 pgs, 3 pools, 2068 bytes data, 20 objects
            102 MB used, 10652 MB / 10754 MB avail
                 164 active+clean

What is up:standby"? in 

# ceph mds stat 
e5: 1/1/1 up {0=ceph-test-3=up:active}, 2 up:standby

Best regards,
Stéphane
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