Operation and Maintenance
Linux Operation and Maintenance
Teach you how to adjust partition size in linux
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:
home: 500G
root: 50G
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 85395456Complete
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