centos7.2 partprobe 执行失败的问题
给ceph的osd配置分区的过程中，想通过partprobe命令及时通知kernel去更新分区表，
所以用parted命令创建完分区后就执行partprobe命令，在centos7.1上代码跑得666的，
但是centos7.2上就发生如下蛋痛的问题：
[root@ai126251006028 udev]# partprobe
Error: Error informing the kernel about modifications to partition /dev/sdb1 -- Device or resource busy. This means Linux won't know about any changes you made to /dev/sdb1 until you reboot -- so you shouldn't mount it or use it in any way before rebooting.
Error: Failed to add partition 1 (Device or resource busy)
[root@ai126251006028 udev]# partprobe
Error: Error informing the kernel about modifications to partition /dev/sdb1 -- Device or resource busy. This means Linux won't know about any changes you made to /dev/sdb1 until you reboot -- so you shouldn't mount it or use it in any way before rebooting.
Error: Failed to add partition 1 (Device or resource busy)
到google上搜索发现针对ceph-deploy工具（http://ceph-users.ceph.narkive.com/nDZS0mBE/ceph-disk-from-jewel-has-issues-on-redhat-7），
有人提了相同的问题，用partx可以搞定。
[root@ai126251006028 udev]# partx -u /dev/sdd
[root@ai126251006028 udev]# partx -u /dev/sdd
[root@ai126251006028 udev]# partprobe
Error: Error informing the kernel about modifications to partition /dev/sdb1 -- Device or resource busy. This means Linux won't know about any changes you made to /dev/sdb1 until you reboot -- so you shouldn't mount it or use it in any way before rebooting.
Error: Failed to add partition 1 (Device or resource busy)
[root@ai126251006028 udev]# partx -u /dev/sdd
[root@ai126251006028 udev]# partx -u /dev/sdd
感觉应该是partprobe跟centos7.2内核有地方不兼容导致的，暂时mark下。
