linux如何无损调整分区大小

  # 设置home分区大小为200G，释放300G空间  $ lvreduce -L 200G /dev/centos/home    # 将空闲空间扩展到root分区  $ lvextend -l +100%FREE /dev/centos/root    # 使用XFS文件系统自带的命令集增加分区空间  $ xfs_growfs /dev/mapper/centos-root  

  $ df -h  Filesystem        Size Used Avail Use% Mounted on  /dev/mapper/centos-root  50G  50G  19M 100% /  devtmpfs         32G   0  32G  0% /dev  tmpfs           32G   0  32G  0% /dev/shm  tmpfs           32G 2.5G  29G  8% /run  tmpfs           32G   0  32G  0% /sys/fs/cgroup  /dev/mapper/centos-home 476G  33M 476G  1% /home  /dev/sda1        497M 238M 259M 48% /boot  tmpfs          6.3G   0 6.3G  0% /run/user/0

  $ lvdisplay  --- Logical volume ---  LV Path        /dev/centos/home  LV Name        home  VG Name        centos  LV UUID        1fAt1E-bQsa-1HXR-MCE2-5VZ1-xzBz-iI1SLv  LV Write Access    read/write  LV Creation host, time localhost, 2016-10-26 17:23:47 +0800  LV Status       available  # open         0  LV Size        475.70 GiB  Current LE       121778  Segments        1  Allocation       inherit  Read ahead sectors   auto  - currently set to   256  Block device      253:2    --- Logical volume ---  LV Path        /dev/centos/root  LV Name        root  VG Name        centos  LV UUID        lD64zY-yc3Z-SZaB-dAjK-03YM-2gM8-pfj4oo  LV Write Access    read/write  LV Creation host, time localhost, 2016-10-26 17:23:48 +0800  LV Status       available  # open         1  LV Size        50.00 GiB  Current LE       12800  Segments        1  Allocation       inherit  Read ahead sectors   auto  - currently set to   256  Block device      253:0  

  # 释放 /dev/centos/home 分区 300G 的空间  # 命令设置 /dev/centos/home 分区 200G空间  $ lvreduce -L 200G /dev/centos/home  WARNING: Reducing active logical volume to 200.00 GiB.   THIS MAY DESTROY YOUR DATA (filesystem etc.)  Do you really want to reduce centos/home? [y/n]: y   Size of logical volume centos/home changed from 475.70 GiB (121778 extents) to 200.00 GiB (51200 extents).   Logical volume centos/home successfully resized.

  $ lvextend -l +100%FREE /dev/centos/root  Size of logical volume centos/root changed from 50.06 GiB (12816 extents) to 325.76 GiB (83394 extents).  Logical volume centos/root successfully resized.

  $ xfs_growfs /dev/mapper/centos-root  meta-data=/dev/mapper/centos-root isize=256  agcount=4, agsize=3276800 blks       =            sectsz=512  attr=2, projid32bit=1       =            crc=0    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=0  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 85395456