当映射好了RBD映像中后，要在其上创建LVM逻辑卷，在执行pvcreate时出错。报错如下：
[root@ceph-master ceph]# pvcreate /dev/rbd0
/dev/sdd: open failed: No medium found
Device /dev/rbd0 excluded by a filter.
可以看到执行创建PV时被过滤器拦截掉了，这是因为默认情况下LVM不支持rbd设备类型，那么在LVM过滤器配置中手动添加RBD类型即可。
调试模式查看详细信息：
# pvcreate -vvvv /dev/rbd0 &> /tmp/out
# less /tmp/out
....
#filters/filter-type.c:27 /dev/rbd0: Skipping: Unrecognised LVM device type 252
....
查看设备类型ID
cat /proc/devices
可以找到rbd设备类型ID编号为252，记住它后接下来在LVM过滤器配置文件中添加它。
修改LVM过滤器配置文件
vim /etc/lvm/lvm.conf
找到types参数，将rbd和252修改为如下配置:
...
# Configuration section devices.
# How LVM uses block devices.
devices {
...
# Configuration option devices/types.
# List of additional acceptable block device types.
# These are of device type names from /proc/devices, followed by the
# maximum number of partitions.
#
# Example
types = [ "rbd", 252 ]
#
# This configuration option is advanced.
# This configuration option does not have a default value defined.
...
现在尝试重新添加rbd设备作为PV：
pvcreate /dev/rbd0
现在可以成功在RBD块设备上执行创建PV操作了。