LVM (Logical Volume Manager) - lvcreate command (create a logical volume)
by
Jeremy Canfield |
Updated: August 09 2021
| LVM (Logical Volume Manager) articles
The lvcreate command can be used to create an LVM logical volume. In this example, a 1 GB logical volume named myLV is created from space in the volume group named myVG. This assumes that a volume group named myVG has been created.
- kibibyte (k or KiB) - 1024 bytes
- kilobyte (K or KB) - 1000 bytes
- mebibyte (m or MiB) - 1024 kibibytes
- megabyte (M or MB) - 1000 kilobytes
- gibibyte (g or GiB) - 1024 mebibytes
- gigabyte (G or GB) - 1000 megabytes
- tebibyte (t or TiB) - 1024 gibibytes
- terabyte (T or TB) - 1000 gigabytes
- pibibyte (p or PiB) - 1024 tebibytes
- petabyte (P or PB) - 1000 gigabytes
- exbibyte (e or EiB) - 1024 pibibytes
- exabyte (E or EX) - 1000 petabytes
~]# lvcreate --size 1G --name myLV myVG
Or, the --extents option can be used. Refer to what are LVM extents to understand what LVM extents are.
- Percentage of available extents in the volume group (e.g. 100%FREE)
- Percentage of total extents in the volume group (e.g. 50%VG)
- Percentage of the available extents in the physical volume (e.g. 25%PVS)
- Percentage of the total extents in the origin logical volume (e.g. 100%ORIGIN)
~]# lvcreate --extents 50%FREE --name myLV myVG
The lvdisplay command can be used to verify the logical volume has been created.
~]# lvdisplay
---Logical volume---
LV Path /dev/myVG/myLV
LV Name myLV
VG Name myVG
LV UUID EuBJ3c-Q8EU0M5ef-Qvip-KeyH-m2Sc-MGelKe
LV Creation host,time localhost.localdomain, 2013-10-11 15:40:12 -0500
LV Status available
# open 1
LV Size 99.94 GiB
Current LE 3198
Segments 3
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:9
Next, the mkfs command can be used to create a file system on myLV. In this example, the ext4 file system is created on myLV.
~]# mkfs.ext4 /dev/myVG/myLV
Now, myLV can be mounted. In this example, myLV is mounted to the /var directory.
~]# mount.ext4 /dev/myVG/myLV /var
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