PVDISPLAY - The pvdisplay command will give you detailed information about each physical volume, under which volume group it is, the unique ID, and the size available. Each command will give you a different output. To check the list of physical volumes, you can run any of the following commands. Physical volume "/dev/sdd" successfully created. Physical volume "/dev/sdc" successfully created. Sample output: Physical volume "/dev/sdb" successfully created. $ sudo pvcreate /dev/sdb /dev/sdc /dev/sdd To initialize any disk as physical volume, use the pvcreate command, with the device name as the argument. Sample output: NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT I have added three disks with different sizes and it totals 10G. Either run all the commands as root user or with sudo privilege. Heads Up: LVM commands require root privilege. If you are learning LVM for the first time, do your testing on any virtual machine. I am using the Ubuntu server running in virtualbox for demonstration. Let us get started with Linux LVM commands. Think of this as equivalent to a standard disk partition.Įnough with the basics. LOGICAL VOLUMESįrom the pool of space (Volume Group) you can create logical volumes. From the volume group, you can create logical partitions. Volume group will hold 5TB of space which is the space available from all the physical volume. You will first initialize the five disks as physical volume and then add them to the volume group. Let's say you have five separate disks with a size of 1 TB each. Volume group is the combination of all the physical volume. It can be an entire disk or standard partitions created from that disk. To put it in simple terms, if you wish to work with LVM, your disk should be initialized as the physical volume. Physical volume is the first layer of abstraction LVM uses to identify the disk tagged for LVM operations. LVM uses three layers of abstraction to create partitions. LVM provides an abstraction of layer between the physical storage and the file system, enabling the file system to be resized, span across multiple physical disks, and use arbitrary disk space.
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