linux如何无损调整分区大小的详细介绍

# 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