本例环境：
sdb sdc sdd 做osd磁盘
sde（ssd盘）做jornal盘，提前用分区工具划分好磁盘三个区，sde1 sde2 sde3
用ssd盘来journal ，命令执行如下
1.格式化磁盘
# ceph-deploy disk zap ceph1:sdb ceph1:sdc ceph1:sdd #sdb sdc sdd为需要格式化的磁盘
2.准备osd
# ceph-deploy --overwrite-conf osd prepare ceph1:sdb:/dev/sde1 ceph1:sdc:/dev/sde2 ceph1:sdd:/dev/sde3
3.修改用来做jornal盘的权限
chown ceph:ceph /dev/sde1
chown ceph:ceph /dev/sde2
chown ceph:ceph /dev/sde3
4.激活osd
# ceph-deploy --overwrite-conf osd activate ceph1:sdb1:/dev/sde1 ceph1:sdc1:/dev/sde2 ceph1:sdd1:/dev/sde3
5.注意点：每次重启机器后需要重新窒息感修改用来做jornal盘的权限的命令（重启后每次需要手动启动）
# chown ceph:ceph /dev/sde1
# chown ceph:ceph /dev/sde2
# chown ceph:ceph /dev/sde3
或者是编辑/etc/rc.local文件加入
vi /etc/rc.local
/usr/bin/chown ceph:ceph /dev/sde1
/usr/bin/chown ceph:ceph /dev/sde2
/usr/bin/chown ceph:ceph /dev/sde3
要注意的是在centos7中，/etc/rc.local文件默认没有可执行权限
需要加入可执行权限
# ll /etc/rc.local
lrwxrwxrwx. 1 root root 13 Sep 4 16:01 /etc/rc.local -> rc.d/rc.local
# ll /etc/rc.d/rc.local
-rw-r--r--. 1 root root 507 Sep 7 21:51 /etc/rc.d/rc.local # 没有可执行的权限
增加可执行权限
# chmod +x /etc/rc.d/rc.local
错误处理：
用ssd盘来journal,格式分区权限问题.报错，如下所示：
[ceph-node2][WARNIN] ceph_disk.main.FilesystemTypeError: Cannot discover filesystem type: device /dev/sdc: Line is truncated:
[ceph-node2][ERROR ] RuntimeError: command returned non-zero exit status: 1
[ceph_deploy][ERROR ] RuntimeError: Failed to execute command: /usr/sbin/ceph-disk -v activate --mark-init systemd --mount /dev/sdc
在报错的节点上执行下面命令
[root@ceph-node3 ~]# ceph-disk activate-all
或者是查看ceph osd的日志文件：
# cat /var/log/ceph/ceph-osd.0.log
2017-10-19 05:28:41.962892 7fefcd45f800 -1 filestore(/var/lib/ceph/osd/ceph-0) mount failed to open journal /var/lib/ceph/osd/ceph-0/journal: (13) Permission denied
2017-10-19 05:28:41.963240 7fefcd45f800 -1 osd.0 0 OSD:init: unable to mount object store
2017-10-19 05:28:41.963248 7fefcd45f800 -1 ** ERROR: osd init failed: (13) Permission denied
发现,权限有问题无法启动osd盘
解决办法：
增加用户和磁盘的权限，重启后也需要增加
# chown ceph:ceph /dev/sdb2
