stuck unclean since forever

[min fang <louisfang2013@xxxxxxxxx>]

Hi, I created a new ceph cluster, and create a pool, but see "stuck unclean since forever" errors happen(as the following), can help point out the possible reasons for this? thanks.

ceph -s
    cluster 602176c1-4937-45fc-a246-cc16f1066f65
     health HEALTH_WARN
            8 pgs degraded
            8 pgs stuck unclean
            8 pgs undersized
            too few PGs per OSD (2 < min 30)
     monmap e1: 1 mons at {ceph-01=172.0.0.11:6789/0}
            election epoch 14, quorum 0 ceph-01
     osdmap e89: 3 osds: 3 up, 3 in
            flags
      pgmap v310: 8 pgs, 1 pools, 0 bytes data, 0 objects
            60112 MB used, 5527 GB / 5586 GB avail
                   8 active+undersized+degraded

ceph health detail
HEALTH_WARN 8 pgs degraded; 8 pgs stuck unclean; 8 pgs undersized; too few PGs per OSD (2 < min 30)
pg 5.0 is stuck unclean since forever, current state active+undersized+degraded, last acting [3]
pg 5.1 is stuck unclean since forever, current state active+undersized+degraded, last acting [3]
pg 5.2 is stuck unclean since forever, current state active+undersized+degraded, last acting [3]
pg 5.3 is stuck unclean since forever, current state active+undersized+degraded, last acting [4]
pg 5.7 is stuck unclean since forever, current state active+undersized+degraded, last acting [3]
pg 5.6 is stuck unclean since forever, current state active+undersized+degraded, last acting [2]
pg 5.5 is stuck unclean since forever, current state active+undersized+degraded, last acting [4]
pg 5.4 is stuck unclean since forever, current state active+undersized+degraded, last acting [4]
pg 5.7 is active+undersized+degraded, acting [3]
pg 5.6 is active+undersized+degraded, acting [2]
pg 5.5 is active+undersized+degraded, acting [4]
pg 5.4 is active+undersized+degraded, acting [4]
pg 5.3 is active+undersized+degraded, acting [4]
pg 5.2 is active+undersized+degraded, acting [3]
pg 5.1 is active+undersized+degraded, acting [3]
pg 5.0 is active+undersized+degraded, acting [3]
too few PGs per OSD (2 < min 30)

ceph osd tree
ID WEIGHT  TYPE NAME                 UP/DOWN REWEIGHT PRIMARY-AFFINITY
-1 3.00000 root default
-2 3.00000     host ceph-01
 2 1.00000         osd.2                  up  1.00000          1.00000
 3 1.00000         osd.3                  up  1.00000          1.00000
 4 1.00000         osd.4                  up  1.00000          1.00000

 ceph osd crush tree
[
    {
        "id": -1,
        "name": "default",
        "type": "root",
        "type_id": 10,
        "items": [
            {
                "id": -2,
                "name": "ceph-01",
                "type": "host",
                "type_id": 1,
                "items": [
                    {
                        "id": 2,
                        "name": "osd.2",
                        "type": "osd",
                        "type_id": 0,
                        "crush_weight": 1.000000,
                        "depth": 2
                    },
                    {
                        "id": 3,
                        "name": "osd.3",
                        "type": "osd",
                        "type_id": 0,
                        "crush_weight": 1.000000,
                        "depth": 2
                    },
                    {
                        "id": 4,
                        "name": "osd.4",
                        "type": "osd",
                        "type_id": 0,
                        "crush_weight": 1.000000,
                        "depth": 2
                    }
                ]
            }
        ]
    }
]

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