今天小编跟大家讲解下有关linux如何无损调整分区大小 ，相信小伙伴们对这个话题应该也很关注吧，小编也收集到了有关linux如何无损调整分区大小 的相关资料，希望小伙伴会喜欢也能够帮助大家。

情况：

home：500G

root：50G

root分区不够用

思路：把home分区的空间划一部分到root分区

# 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

实例

situation

挂载在根目录的分区 /dev/mapper/centos-root 爆满，占用100%

$ 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

analyze

挂载在根目录的分区空间太小，只有50G，而服务器 home 目录为非常用目录，挂在了近500G的空间。

思路：从 centos-home 分区划出300G空间到 centos-root 分区。

operation

1.查看各分区信息

$ 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

2.减少/home分区空间

# 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.

3.增加/root分区空间

$ 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.

4.扩展XFS文件空间大小

$ 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

完成

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