The problem can not be uninstalled mount directory

[ceph01 the root @ ~] # the fuser / var / lib / Ceph / OSD / Ceph-0
/ var / lib / Ceph / OSD / Ceph-0: 7565
[ceph01 the root @ ~] -9 # 7565 the kill
[the root ~ @ ceph01 ] # umount / var / lib / Ceph / OSD / Ceph-0
[the root @ ceph01 ~] # umount / var / lib / Ceph / OSD / Ceph-. 1
umount: / var / lib / Ceph / OSD / Ceph-. 1: target busy.
(In some cases by lsof (8) or fuser (1)
find useful process information about using the device)
[the root @ ceph01 ~] # the fuser / var / lib / Ceph / OSD / Ceph-. 1
/ var / lib / Ceph / OSD /-Ceph. 1: 7568
[ceph01 the root @ ~] -9 # 7568 the kill
[the root ceph01 @ ~] # umount / var / lib / Ceph / OSD /-Ceph. 1
[ceph01 the root @ ~] # DF - Th
type of file system capacity has been available with a mount point%
/ dev / Mapper / XFS CentOS the root 50G-48G. 6% 2.6G /
devtmpfs devtmpfs 475M 0 475M 0% / dev
tmpfs tmpfs 487m 2% 7.6M 479M / RUN
tmpfs tmpfs 487M 0 487M 0% /sys/fs/cgroup