lvm_reduce_volume_size
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lvm_reduce_volume_size [2020/04/29 22:27] xavier created |
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| Before working through the resizing process it’s important you first understand some basic concepts around physical volumes, volume groups, logical volumes, and the file system. | Before working through the resizing process it’s important you first understand some basic concepts around physical volumes, volume groups, logical volumes, and the file system. | ||
| - | Physical Volume (PV): This can be created on a whole physical disk (think /dev/sda) or a Linux partition. | + | * Physical Volume (PV): This can be created on a whole physical disk (think /dev/sda) or a Linux partition. |
| - | Volume Group (VG): This is made up of at least one or more physical volumes. | + | * Volume Group (VG): This is made up of at least one or more physical volumes. |
| - | Logical Volume (LV): This is sometimes referred to as the partition, it sits within a volume group and has a file system written to it. | + | * Logical Volume (LV): This is sometimes referred to as the partition, it sits within a volume group and has a file system written to it. |
| - | File System: A file system such as ext4 will be on the logical volume. | + | * File System: A file system such as ext4 will be on the logical volume. |
| ===== LVM Resize – How to decrease or shrink the logical volume ===== | ===== LVM Resize – How to decrease or shrink the logical volume ===== | ||
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| After you’ve either booted back to primary operating system or completed the mount, check the space shown with the ‘df’ command to confirm it has been decreased as expected. | After you’ve either booted back to primary operating system or completed the mount, check the space shown with the ‘df’ command to confirm it has been decreased as expected. | ||
| - | ''[root@CentOS7 /]# df -h | + | ''[root@CentOS7 /]# df -h\\ |
| - | Filesystem Size Used Avail Use% Mounted on | + | Filesystem Size Used Avail Use% Mounted on\\ |
| - | /dev/mapper/centos-root 9.8G 1.4G 8.5G 14% / | + | /dev/mapper/centos-root 9.8G 1.4G 8.5G 14% /\\ |
| - | devtmpfs 908M 0 908M 0% /dev | + | devtmpfs 908M 0 908M 0% /dev\\ |
| - | tmpfs 914M 0 914M 0% /dev/shm | + | tmpfs 914M 0 914M 0% /dev/shm\\ |
| - | tmpfs 914M 8.6M 905M 1% /run | + | tmpfs 914M 8.6M 905M 1% /run\\ |
| - | tmpfs 914M 0 914M 0% /sys/fs/cgroup | + | tmpfs 914M 0 914M 0% /sys/fs/cgroup\\ |
| - | /dev/sda1 497M 96M 402M 20% /boot | + | /dev/sda1 497M 96M 402M 20% /boot\\ |
| - | /dev/mapper/centos-var 4.8G 20M 4.6G 1% /mnt'' | + | /dev/mapper/centos-var 4.8G 20M 4.6G 1% /mnt''\\ |
| In this example /dev/centos/var is correctly showing as shrunk down from the original 10G. | In this example /dev/centos/var is correctly showing as shrunk down from the original 10G. | ||
lvm_reduce_volume_size.1588199238.txt.gz · Last modified: 2020/04/29 22:27 by xavier
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