lvcreate: command in Linux
The lvcreate command in Linux is used to create a new logical volume in the LVM (Logical Volume Manager) system. It allows you to allocate space from a volume group and create a logical volume that can be used for various purposes, such as creating file systems, mounting partitions, or storing data.
lvcreate [options] VG/LV
optionsare the various options available for the lvcreate command.
VGis the name of the volume group from which space will be allocated.
LVis the name of the logical volume to be created.
1. Create a logical volume with default size:
lvcreate -n mylv myvg
This command creates a logical volume named “mylv” in the volume group “myvg” with the default size, which is the maximum available space in the volume group.
2. Create a logical volume with a specific size:
lvcreate -L 1G -n mylv myvg
This command creates a logical volume named “mylv” in the volume group “myvg” with a size of 1GB.
3. Create a logical volume with a specific size and extents:
lvcreate -l 100 -n mylv myvg
This command creates a logical volume named “mylv” in the volume group “myvg” with a size of 100 extents. Extents are the basic unit of allocation in LVM.
4. Create a striped logical volume:
lvcreate -i 2 -I 64 -n mylv myvg
This command creates a striped logical volume named “mylv” in the volume group “myvg” with a stripe count of 2 and a stripe size of 64KB. Striping distributes data across multiple physical volumes for improved performance.
Some similar commands to lvcreate are:
lvextend: Used to extend the size of a logical volume.
lvreduce: Used to reduce the size of a logical volume.
lvremove: Used to remove a logical volume.
The lvcreate command is commonly used for the following purposes:
- Creating logical volumes for file systems.
- Creating logical volumes for database storage.
- Creating logical volumes for virtual machine storage.
- Creating logical volumes for backup storage.
Ideas for Automation:
Here are some ideas for automating the lvcreate command:
- Write a script to prompt the user for the required inputs (volume group name, logical volume name, size, etc.) and automatically run the lvcreate command with the provided inputs.
- Create a configuration file that contains the required inputs for the lvcreate command, and write a script to read the configuration file and run the lvcreate command with the provided inputs.
- Integrate the lvcreate command into a larger automation framework or tool, such as Ansible or Puppet, to automatically create logical volumes as part of a larger infrastructure provisioning process.
Table of Useful Data:
|Specify the size of the logical volume.
|Specify the number of extents for the logical volume.
|Specify the name of the logical volume.
|Specify the number of stripes for a striped logical volume.
|Specify the stripe size for a striped logical volume.
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