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:
home: 500G
root: 50G
The root partition is not enough
Idea: divide part of the space of the home partition into the root partition
1 2 3 4 5 6 7 8 | # 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
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Instance
situation
The partition /dev/mapper/centos-root mounted in the root directory is full and occupies 100%
1 2 3 4 5 6 7 8 9 10 | $ 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
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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
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 | $ 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
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2. Reduce the /home partition space
1 2 3 4 5 6 7 8 | # 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.
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3. Increase the /root partition space
1 2 3 | $ 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.
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4.Expand the XFS file space size
1 2 3 4 5 6 7 8 9 10 11 | $ 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
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Complete
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