Introduction
Logical Volume Management (LVM) is a powerful tool in the world of Linux system administration that allows for efficient management of storage resources. One important aspect of working with LVM is understanding how to create logical volumes with the appropriate size to meet the requirements of your system. In this article, we will explore the various options available for specifying the size of logical volumes when using the `lvcreate` command in LVM.
Creating a Logical Volume with Maximum Size
When creating a logical volume with the maximum available size, you can use the `lvcreate` command with the `--extents` option. This option allows you to specify the number of physical extents to allocate to the logical volume. By specifying the maximum number of extents available in the volume group, you can create a logical volume that utilizes all available space.
For example, to create a logical volume with the maximum size available in the volume group named `vg01`, you can use the following command:
lvcreate -l 100%FREE -n lv01 vg01
In this command, the `-l 100%FREE` option tells `lvcreate` to allocate all available extents in the volume group to the logical volume `lv01`. This ensures that the logical volume is created with the maximum size possible based on the available space in the volume group.
Creating a Logical Volume with a Specific Size
If you need to create a logical volume with a specific size, you can use the `--size` option with the `lvcreate` command. This option allows you to specify the size of the logical volume in various formats such as megabytes, gigabytes, terabytes, or as a percentage of the total space in the volume group.
For example, to create a logical volume named `lv02` with a size of 10GB in the volume group `vg01`, you can use the following command:
lvcreate --size 10G -n lv02 vg01
In this command, the `--size 10G` option specifies that the logical volume `lv02` should be created with a size of 10 gigabytes in the volume group `vg01`. This allows you to create logical volumes with specific sizes tailored to your system's requirements.
Creating a Logical Volume with the Maximum Size from Available Physical Volumes
When creating a new logical volume, you may want to ensure that it is created with the maximum size possible based on the available space across multiple physical volumes in the volume group. In such cases, you can use the `--extents` option with the `lvcreate` command and specify the physical volumes to use for allocation.
For example, to create a logical volume named `lv03` with the maximum size available across all physical volumes in the volume group `vg01`, you can use the following command:
lvcreate --extents 100%FREE -n lv03 vg01 /dev/sda /dev/sdb
In this command, the `--extents 100%FREE` option tells `lvcreate` to allocate all available extents across the specified physical volumes `/dev/sda` and `/dev/sdb` to the logical volume `lv03`. This ensures that the logical volume is created with the maximum size possible based on the combined space of the selected physical volumes.
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