H3Cloud OS格式化卷报错/dev/sdx is apparently in use by the system

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现场部署H3Cloud OS前需要将挂载的存储卷格式化为ext4文件系统，在执行 mkfs.ext4 /dev/sdx 时报错如下：

[root@masterOS-72 ~]# mkfs.ext4 /dev/sdo

mke2fs 1.42.9 (28-Dec-2013)

/dev/sdo is entire device, not just one partition!

Proceed anyway? (y,n) y

/dev/sdo is apparently in use by the system; will not make a filesystem here!    

报错提示/dev/sdo 正在被使用。 /dev/sdk1 正在被DM管理，所以我们创建文件系统时提示报错，我们手工的移除，就可以正常的创建文件系统，操作如下：

[root@masterOS-72 ~]# dmsetup status   //查看DM管理状态，发现已经配置了存储多路径

ce-elasticsearch1: 0 629145600 multipath 2 0 0 0 1 1 A 0 1 0 8:208 A 0

ce-elasticsearch0: 0 62914560 multipath 2 0 0 0 1 1 A 0 1 0 8:128 A 0

elasticsearch2: 0 209715200 multipath 2 0 0 0 1 1 A 0 1 0 8:0 A 0

ae-cloudify-resource: 0 209715200 multipath 2 0 0 0 1 1 A 0 1 0 8:176 A 0

elasticsearch1: 0 419430400 multipath 2 0 0 0 1 1 A 0 1 0 8:16 A 0

Postgresql: 0 10485760 multipath 2 0 0 0 1 1 A 0 1 0 8:48 A 0

elasticsearch0: 0 104857600 multipath 2 0 0 0 1 1 A 0 1 0 8:160 A 0

harbor-log: 0 104857600 multipath 2 0 0 0 1 1 A 0 1 0 8:64 A 0

openstack-glance: 0 209715200 multipath 2 0 0 0 1 1 A 0 1 0 8:32 A 0

ae-cloudify-apporch: 0 20971520 multipath 2 0 0 0 1 1 A 0 1 0 8:224 A 0

nexus: 0 209715200 multipath 2 0 0 0 1 1 A 0 1 0 8:80 A 0

openstack-gnocchi: 0 209715200 multipath 2 0 0 0 1 1 A 0 1 0 8:96 A 0

harbor-registry: 0 1048576000 multipath 2 0 0 0 1 1 A 0 1 0 8:112 A 0

terraform: 0 209715200 multipath 2 0 0 0 1 1 A 0 1 0 8:144 A 0

ce-elasticsearch2: 0 209715200 multipath 2 0 0 0 1 1 A 0 1 0 8:192 A 0

centos-swap: 0 33554432 linear

centos-root: 0 405651456 linear

[root@masterOS-72 ~]# dmsetup remove_all   //移除DM管理

[root@masterOS-72 ~]# dmsetup status   //查看DM管理状态已被移除

centos-swap: 0 33554432 linear

centos-root: 0 405651456 linear

[root@masterOS-72 ~]# mkfs.ext4 /dev/sdo   //重新格式化正常

mke2fs 1.42.9 (28-Dec-2013)

/dev/sdo is entire device, not just one partition!

Proceed anyway? (y,n) y

Filesystem label=

OS type: Linux

Block size=4096 (log=2)

Fragment size=4096 (log=2)

Stride=0 blocks, Stripe width=0 blocks

655360 inodes, 2621440 blocks

131072 blocks (5.00%) reserved for the super user

First data block=0

Maximum filesystem blocks=2151677952

80 block groups

32768 blocks per group, 32768 fragments per group

8192 inodes per group

Superblock backups stored on blocks:

32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632

Allocating group tables: done                           

Writing inode tables: done                           

Creating journal (32768 blocks): done

Writing superblocks and filesystem accounting information: done

在后台执行挂载存储卷相关操作时请严格按照开局文档按照顺序执行相关命令，必须先格式化后才能配置存储多路径，否则无法正常格式化存储卷为ext4文件系统。