Centos7.3无损磁盘空间调整

• 查看磁盘空间

  [root@slave1 ~]# df -h
  Filesystem           Size  Used Avail Use% Mounted on
  /dev/mapper/cl-root   50G   28G   23G  55% /
  devtmpfs             6.8G     0  6.8G   0% /dev
  tmpfs                6.7G   84K  6.7G   1% /dev/shm
  tmpfs                6.7G   41M  6.7G   1% /run
  tmpfs                6.7G     0  6.7G   0% /sys/fs/cgroup
  /dev/xvda1          1014M  173M  842M  17% /boot
  /dev/mapper/cl-home  343G   72M  343G   1% /home
  tmpfs                1.4G     0  1.4G   0% /run/user/0
  tmpfs                1.4G   16K  1.4G   1% /run/user/42
  cm_processes         6.7G  251M  6.5G   4% /run/cloudera-scm-agent/process
  tmpfs                1.4G     0  1.4G   0% /run/user/1000
  

• 备份数据

  [root@slave1 ~]# tar zcvf /tmp/home.tar /home
  

• 取消挂载

  [root@slave1 ~]# umount /home
  umount: /home: target is busy.
        (In some cases useful info about processes that use
         the device is found by lsof(8) or fuser(1))
  You have new mail in /var/spool/mail/root
  

• 查看磁盘占用(因为占用,无法取消挂载)

  [root@slave1 ~]# fuser -m -v /home
                     USER        PID ACCESS COMMAND
  /home:               root     kernel mount /home
                     cm        23054 ..c.. sftp-server
                     cm        23071 ..c.. bash
  

• 解除磁盘占用

  [root@slave1 ~]# fuser -m -v -i -k /home
                     USER        PID ACCESS COMMAND
  /home:               root     kernel mount /home
                     cm        23054 ..c.. sftp-server
                     cm        23071 ..c.. bash
  Kill process 23054 ? (y/N) y
  Kill process 23071 ? (y/N) y
  

• 取消挂载

  [root@slave1 ~]# umount /home
  

• 删除/home所在的lv

  [root@slave1 ~]# lvremove /dev/mapper/cl-home
  Do you really want to remove active logical volume cl/home? [y/n]: y
  Logical volume "home" successfully removed
  

• 扩展/root所在的lv，增加290G

  [root@slave1 ~]# lvextend -L +290G /dev/mapper/cl-root
  Size of logical volume cl/root changed from 50.00 GiB (12800 extents) to 340.00 GiB (87040 extents).
  Logical volume cl/root successfully resized.
  

• 扩展/root文件系统

  [root@slave1 ~]# xfs_growfs /dev/mapper/cl-root
  meta-data=/dev/mapper/cl-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 89128960
  

• 重新创建home lv (50G)

  [root@slave1 ~]# lvcreate -L 50G -n home cl
  Logical volume "home" created.
  

• 创建文件系统

  [root@slave1 ~]# mkfs.xfs /dev/cl/home
  meta-data=/dev/cl/home           isize=512    agcount=4, agsize=3276800 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=0, sparse=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 log           bsize=4096   blocks=6400, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
  realtime =none                   extsz=4096   blocks=0, rtextents=0
  

• 挂载/home

  [root@slave1 ~]# mount /dev/cl/home /home
  

• 查看磁盘空间

  [root@slave1 ~]# df -h
  Filesystem           Size  Used Avail Use% Mounted on
  /dev/mapper/cl-root  340G   28G  313G   8% /
  devtmpfs             6.8G     0  6.8G   0% /dev
  tmpfs                6.7G   84K  6.7G   1% /dev/shm
  tmpfs                6.7G   41M  6.7G   1% /run
  tmpfs                6.7G     0  6.7G   0% /sys/fs/cgroup
  /dev/xvda1          1014M  173M  842M  17% /boot
  tmpfs                1.4G     0  1.4G   0% /run/user/0
  tmpfs                1.4G   16K  1.4G   1% /run/user/42
  cm_processes         6.7G  251M  6.5G   4% /run/cloudera-scm-agent/process
  /dev/mapper/cl-home   50G   33M   50G   1% /home
  

• 恢复文件

  [root@slave1 ~]# tar zxvf /tmp/home.tar -C /