Configure a Client Host [client] to use Ceph Storage like follows.

        +--------------------+           |
        |[client.srv.local]  |10.0.0.30  |
        |     Ceph Client    +-----------+
        |                    |           |
        +--------------------+           |
            +----------------------------+----------------------------+
            |                            |                            |
            |10.0.0.51                   |10.0.0.52                   |10.0.0.53 
+-----------+-----------+    +-----------+-----------+    +-----------+-----------+
|   [node01.srv.local]  |    |   [node02.srv.local]  |    |   [node03.srv.local]  |
|     Object Storage    +----+     Object Storage    +----+     Object Storage    |
|     Monitor Daemon    |    |                       |    |                       |
|     Manager Daemon    |    |                       |    |                       |
+-----------------------+    +-----------------------+    +-----------------------+

For exmaple, Create a block device and mount it on a Client Host.

[1] Transfer SSH public key to Client Host and Configure it from Admin Node.

# transfer public key
root@node01:~# ssh-copy-id client
# install required packages
root@node01:~# ssh client "apt -y install ceph-common"
# transfer required files to Client Host
root@node01:~# scp /etc/ceph/ceph.conf client:/etc/ceph/
ceph.conf                                     100%  195    98.1KB/s   00:00
root@node01:~# scp /etc/ceph/ceph.client.admin.keyring client:/etc/ceph/
ceph.client.admin.keyring                     100%  151    71.5KB/s   00:00
root@node01:~# ssh client "chown ceph. /etc/ceph/ceph.*"

[2] Create a Block device and mount it on a Client Host.

# create default RBD pool [rbd]
root@client:~# ceph osd pool create rbd 128
pool 'rbd' created
# enable Placement Groups auto scale mode
root@client:~# ceph osd pool set rbd pg_autoscale_mode on
set pool 2 pg_autoscale_mode to on
# initialize the pool
root@client:~# rbd pool init rbd
root@client:~# ceph osd pool autoscale-status
POOL                     SIZE  TARGET SIZE  RATE  RAW CAPACITY   RATIO  TARGET RATIO  EFFECTIVE RATIO  BIAS  PG_NUM  NEW PG_NUM  AUTOSCALE
device_health_metrics      0                 3.0        239.9G  0.0000                                  1.0       1              on
rbd                        6                 3.0        239.9G  0.0000                                  1.0     128          32  on

# create a block device with 10G
root@client:~# rbd create --size 10G --pool rbd rbd01
# confirm
root@client:~# rbd ls -l
NAME   SIZE    PARENT  FMT  PROT  LOCK
rbd01  10 GiB            2

# map the block device
root@client:~# rbd map rbd01
/dev/rbd0
# confirm
root@client:~# rbd showmapped
id  pool  namespace  image  snap  device
0   rbd              rbd01  -     /dev/rbd0

# format with XFS
root@client:~# mkfs.xfs /dev/rbd0
meta-data=/dev/rbd0              isize=512    agcount=16, agsize=163840 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=1, sparse=1, rmapbt=0
         =                       reflink=1
data     =                       bsize=4096   blocks=2621440, imaxpct=25
         =                       sunit=16     swidth=16 blks
naming   =version 2              bsize=4096   ascii-ci=0, ftype=1
log      =internal log           bsize=4096   blocks=2560, version=2
         =                       sectsz=512   sunit=16 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0

root@client:~# mount /dev/rbd0 /mnt
root@client:~# df -hT
Filesystem                        Type      Size  Used Avail Use% Mounted on
udev                              devtmpfs  1.9G     0  1.9G   0% /dev
tmpfs                             tmpfs     394M  1.1M  393M   1% /run
/dev/mapper/ubuntu--vg-ubuntu--lv ext4       25G  3.1G   21G  14% /
tmpfs                             tmpfs     2.0G     0  2.0G   0% /dev/shm
tmpfs                             tmpfs     5.0M     0  5.0M   0% /run/lock
tmpfs                             tmpfs     2.0G     0  2.0G   0% /sys/fs/cgroup
/dev/loop0                        squashfs   55M   55M     0 100% /snap/core18/1880
/dev/vda2                         ext4      976M  197M  713M  22% /boot
/dev/loop3                        squashfs   72M   72M     0 100% /snap/lxd/16100
/dev/loop4                        squashfs   30M   30M     0 100% /snap/snapd/8542
/dev/loop6                        squashfs   30M   30M     0 100% /snap/snapd/8790
/dev/loop7                        squashfs   56M   56M     0 100% /snap/core18/1885
tmpfs                             tmpfs     394M     0  394M   0% /run/user/0
/dev/loop2                        squashfs   71M   71M     0 100% /snap/lxd/16926
/dev/rbd0                         xfs        10G  105M  9.9G   2% /mnt

[3] For delete Block devices or Pools you created, run commands like follows.

For deleting Pools, it needs to set [mon allow pool delete = true] on [Monitor Daemon] configuration.

# unmap
root@client:~# rbd unmap /dev/rbd/rbd/rbd01
# delete a block device
root@client:~# rbd rm rbd01 -p rbd
Removing image: 100% complete...done.
# delete a pool
# ceph osd pool delete [Pool Name] [Pool Name] ***
root@client:~# ceph osd pool delete rbd rbd --yes-i-really-really-mean-it
pool 'rbd' removed