Teach you how to adjust partition size in linux

This article mainly introduceslinuxHow to resize the partition without loss. The editor thinks it is quite good. Now I will share it with you and give it as a reference. Let’s follow the editor and take a look.

Situation:

1. home: 500G

2. root: 50G

3. The root partition is not enough

Idea: divide part of the space of the home partition into the root partition

# 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

Instance

situation

The partition /dev/mapper/centos-root mounted in the root directory is full and occupies 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

The partition space mounted in the root directory is too small, only 50G, and the server home directory is a very common directory and is mounted on Nearly 500G of space.

Idea: Allocate 300G space from the centos-home partition to the centos-root partition.

operation

1. Check the information of each partition

$ 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. Reduce the /home partition space

# 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. Increase the /root partition space

$ 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.Expand the XFS file space size

$ 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

Complete

[Related recommendations]

1. Mysql free video tutorial

2. Detailed explanation of innodb_index_stats when importing data Error prompting table primary key conflict

3. Example details innodb_autoinc_lock_mode in mysql

4. Detailed example of adding new user permissions in MySQL

##5.

How does Linux detect server network conditions

The above is the detailed content of Teach you how to adjust partition size in linux. For more information, please follow other related articles on the PHP Chinese website!