sr05@SR05-1:~$ dd if=/dev/zero of=file.txt count=1048576 bs=1024
1048576+0 records in
1048576+0 records out
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 3.67193 s, 292 MB/s
sr05@SR05-1:~$ ls
ceph-deploy-ceph.log  file.txt  my-cluster
sr05@SR05-1:~$ sudo ceph -s
  cluster:
    id:     407124ce-2e7c-45c0-878a-b93116505e1a
    health: HEALTH_OK

  services:
    mon: 3 daemons, quorum SR05-1,SR05-2,SR05-3
    mgr: SR05-3(active)
    mds: inoki-cephfs-1/1/1 up  {0=SR05-1=up:active}, 1 up:standby
    osd: 3 osds: 3 up, 3 in
    rgw: 1 daemon active

  data:
    pools:   6 pools, 36 pgs
    objects: 243  objects, 118 KiB
    usage:   3.0 GiB used, 197 GiB / 200 GiB avail
    pgs:     36 active+clean

sr05@SR05-1:~$ cp file.txt /mnt/
ceph/     mycephfs/
sr05@SR05-1:~$ cp file.txt /mnt/mycephfs/
cp: cannot create regular file '/mnt/mycephfs/file.txt': Permission denied
sr05@SR05-1:~$ sudo cp file.txt /mnt/mycephfs/
sr05@SR05-1:~$ sudo ceph -s
  cluster:
    id:     407124ce-2e7c-45c0-878a-b93116505e1a
    health: HEALTH_OK

  services:
    mon: 3 daemons, quorum SR05-1,SR05-2,SR05-3
    mgr: SR05-3(active)
    mds: inoki-cephfs-1/1/1 up  {0=SR05-1=up:active}, 1 up:standby
    osd: 3 osds: 3 up, 3 in
    rgw: 1 daemon active

  data:
    pools:   6 pools, 36 pgs
    objects: 466  objects, 892 MiB
    usage:   5.6 GiB used, 194 GiB / 200 GiB avail
    pgs:     36 active+clean

  io:
    client:   74 MiB/s wr, 0 op/s rd, 23 op/s wr

sr05@SR05-1:~$ sudo ceph -s
  cluster:
    id:     407124ce-2e7c-45c0-878a-b93116505e1a
    health: HEALTH_OK

  services:
    mon: 3 daemons, quorum SR05-1,SR05-2,SR05-3
    mgr: SR05-3(active)
    mds: inoki-cephfs-1/1/1 up  {0=SR05-1=up:active}, 1 up:standby
    osd: 3 osds: 3 up, 3 in
    rgw: 1 daemon active

  data:
    pools:   6 pools, 36 pgs
    objects: 499  objects, 1.0 GiB
    usage:   6.0 GiB used, 194 GiB / 200 GiB avail
    pgs:     36 active+clean

  io:
    client:   255 B/s wr, 0 op/s rd, 0 op/s wr

sr05@SR05-1:~$ sudo ceph -s
  cluster:
    id:     407124ce-2e7c-45c0-878a-b93116505e1a
    health: HEALTH_OK

  services:
    mon: 3 daemons, quorum SR05-1,SR05-2,SR05-3
    mgr: SR05-3(active)
    mds: inoki-cephfs-1/1/1 up  {0=SR05-1=up:active}, 1 up:standby
    osd: 3 osds: 3 up, 3 in
    rgw: 1 daemon active

  data:
    pools:   6 pools, 36 pgs
    objects: 499  objects, 1.0 GiB
    usage:   6.0 GiB used, 194 GiB / 200 GiB avail
    pgs:     36 active+clean