linux如何无损调整分区大小

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

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。

linux如何无损调整分区大小

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