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

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