mount.nfs: mounting 10.0.19.209:/sub1 failed, reason given by server: No such file or directory

# ceph nfs export ls nfs-cephfs --detailed
[
  {
    "access_type": "RW",
    "clients": [],
    "cluster_id": "nfs-cephfs",
    "export_id": 3,
    "fsal": {
      "fs_name": "myFs",
      "name": "CEPH",
      "user_id": "nfs.nfs-cephfs.3"
    },
    "path": "/volumes/_nogroup/test-new-dir/cb970711-3e9a-49c4-a738-65162c7e6c50",
    "protocols": [
      3,
      4
    ],
    "pseudo": "/testnew",
    "security_label": false,
    "squash": "no_root_squash",
    "transports": [
      "TCP",
      "UDP"
    ]
  },
  {
    "access_type": "RW",
    "clients": [],
    "cluster_id": "nfs-cephfs",
    "export_id": 2,
    "fsal": {
      "fs_name": "myFs",
      "name": "CEPH",
      "user_id": "nfs.nfs-cephfs.2"
    },
    "path": "/volumes/_nogroup/sub1/4e41f944-ca76-4378-b03d-303cf0489fbd",
    "protocols": [
      3,
      4
    ],
    "pseudo": "/sub1",
    "security_label": false,
    "squash": "no_root_squash",
    "transports": [
      "TCP",
      "UDP"
    ]
  },
  {
    "access_type": "RW",
    "clients": [],
    "cluster_id": "nfs-cephfs",
    "export_id": 1,
    "fsal": {
      "fs_name": "myFs",
      "name": "CEPH",
      "user_id": "nfs.nfs-cephfs.1"
    },
    "path": "/volumes/_nogroup/test/7d54164f-2286-46f2-820a-d5700ad1dc40",
    "protocols": [
      4
    ],
    "pseudo": "/test2",
    "security_label": false,
    "squash": "no_root_squash",
    "transports": [
      "TCP"
    ]
  }
]

这里只有testnew是挂成功的，其他的都失败了

# mount |grep nfs
10.0.19.209:/testnew on /mnt/nfs3 type nfs4 (rw,relatime,vers=4.2,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,clientaddr=10.0.19.208,local_lock=none,addr=10.0.19.209)

另外一个：

root@ww208:/mnt# mount -t nfs 10.0.19.209:/sub1 /mnt/nfs
mount.nfs: mounting 10.0.19.209:/sub1 failed, reason given by server: No such file or directory

请问是什么原因？