关于xfs和ext4的区别，请自行度娘

centos7默认xfs为文件系统， xfs因为只能增大，不能减少，所以需要调整/home，增大/,需要安装xfsdump,步骤如下，做个记录：

yum install xfsdump -y

查看现有分区情况：

/dev/mapper/cl_hadoop-root   50G  3.1G   47G   7% /

devtmpfs                    7.7G     0  7.7G   0% /dev

tmpfs                       7.8G     0  7.8G   0% /dev/shm

tmpfs                       7.8G  8.4M  7.8G   1% /run

tmpfs                       7.8G     0  7.8G   0% /sys/fs/cgroup

/dev/mapper/cl_hadoop-home  142G  424M  141G   1% /home

/dev/vda1                  1014M  139M  876M  14% /boot

tmpfs                       1.6G     0  1.6G   0% /run/user/0

需要减少/home目录，增大/目录，先备份一下/home目录：

xfsdump -l 0 -L home -M home -f /opt/home.xfsdump /home

卸载/home目录：

umount /home

调整/home目录到5G:

lvreduce -L 5G /dev/mapper/cl_hadoop-home

WARNING: Reducing active logical volume to 5.00 GiB.

THIS MAY DESTROY YOUR DATA (filesystem etc.)

Do you really want to reduce cl_hadoop/home? [y/n]: y

Size of logical volume cl_hadoop/home changed from 141.18 GiB (36142 extents) to 5.00 GiB (1280 extents).

Logical volume cl_hadoop/home successfully resized.

增大/目录：

lvextend -l +100%FREE /dev/cl_hadoop/root

Size of logical volume cl_hadoop/root changed from 50.00 GiB (12800 extents) to 186.18 GiB (47663 extents).

Logical volume cl_hadoop/root successfully resized.

延伸/目录空间：

xfs_growfs /dev/cl_hadoop/root

meta-data=/dev/mapper/cl_hadoop-root isize=512    agcount=4, agsize=3276800 blks

=                       sectsz=512   attr=2, projid32bit=1

=                       crc=1        finobt=0 spinodes=0

data     =                       bsize=4096   blocks=13107200, imaxpct=25

=                       sunit=0      swidth=0 blks

naming   =version 2              bsize=4096   ascii-ci=0 ftype=1

log      =internal               bsize=4096   blocks=6400, version=2

=                       sectsz=512   sunit=0 blks, lazy-count=1

realtime =none                   extsz=4096   blocks=0, rtextents=0

data blocks changed from 13107200 to 48806912

重新格式化home分区：

mkfs.xfs -f /dev/mapper/cl_hadoop-home

meta-data=/dev/mapper/cl_hadoop-home isize=512    agcount=4, agsize=327680 blks

=                       sectsz=512   attr=2, projid32bit=1

=                       crc=1        finobt=0, sparse=0

data     =                       bsize=4096   blocks=1310720, imaxpct=25

=                       sunit=0      swidth=0 blks

naming   =version 2              bsize=4096   ascii-ci=0 ftype=1

log      =internal log           bsize=4096   blocks=2560, version=2

=                       sectsz=512   sunit=0 blks, lazy-count=1

realtime =none                   extsz=4096   blocks=0, rtextents=0

挂在home目录：

mount /home

还原备份文件到/home目录：

xfsrestore -f /opt/home.xfsdump /home

xfsrestore: using file dump (drive_simple) strategy

xfsrestore: version 3.1.4 (dump format 3.0) - type ^C for status and control

xfsrestore: searching media for dump

xfsrestore: examining media file 0

xfsrestore: dump description:

xfsrestore: hostname: hadoop

xfsrestore: mount point: /home

xfsrestore: volume: /dev/mapper/cl_hadoop-home

xfsrestore: session time: Sat Aug  5 19:49:06 2017

xfsrestore: level: 0

xfsrestore: session label: "home"

xfsrestore: media label: "home"

xfsrestore: file system id: f716ff51-3556-491a-a324-de943e23277b

xfsrestore: session id: 47a21c87-c24e-47fe-a501-cd5f5565c6c5

xfsrestore: media id: 553706c1-917a-440a-9cd8-31779fa17089

xfsrestore: using online session inventory

xfsrestore: searching media for directory dump

xfsrestore: reading directories

xfsrestore: 4 directories and 14 entries processed

xfsrestore: directory post-processing

xfsrestore: restoring non-directory files

xfsrestore: restore complete: 1 seconds elapsed

xfsrestore: Restore Summary:

xfsrestore:   stream 0 /opt/home.xfsdump OK (success)

xfsrestore: Restore Status: SUCCESS

重新查看分区情况：

Filesystem                  Size  Used Avail Use% Mounted on

/dev/mapper/cl_hadoop-root  187G  3.1G  184G   2% /

devtmpfs                    7.7G     0  7.7G   0% /dev

tmpfs                       7.8G     0  7.8G   0% /dev/shm

tmpfs                       7.8G  8.4M  7.8G   1% /run

tmpfs                       7.8G     0  7.8G   0% /sys/fs/cgroup

/dev/vda1                  1014M  139M  876M  14% /boot

tmpfs                       1.6G     0  1.6G   0% /run/user/0

/dev/mapper/cl_hadoop-home  5.0G  424M  4.6G   9% /home

到此调整完成，以后再补充！

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