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What is volume group and logical volume?
Description: A volume group can be sliced up into any number of logical volumes. Logical volumes are functionally equivalent to partitions on a physical disk, but with much more flexibility. Logical volumes are the primary component that users and applications will interact with.
Is a logical grouping of volumes?
Logical volumes are groups of information located on physical volumes. A hierarchy of structures is used to manage disk storage. Each individual disk drive, called a physical volume (PV) has a name, such as /dev/hdisk0. Every physical volume in use belongs to a volume group (VG).
What is PV VG LV Linux?
Some of the terms which you need to understand while using LVM: Physical Volume (PV): Consists of Raw disks or RAID arrays or other storage devices. Volume Group (VG): Combines the physical volumes into storage groups. Logical Volume (LV): VG’s are divided into LV’s and are mounted as partitions.
What is LVM used for?
Logical volume management (LVM) is a form of storage virtualization that offers system administrators a more flexible approach to managing disk storage space than traditional partitioning. This type of virtualization tool is located within the device-driver stack on the operating system.
How do you check if VG is active or not?
You may check the status of the volume group by issuing the lsvg command. Depending on your configuration, the lsvg command returns the following settings: VG STATE will be active if it is varied on either actively or passively.
Is the 4tb is the limited size for volume group in LVM?
For LVM volumes created with lvm2, the limit is determined by the kernel limits (and your disk space). The default extent size with SUSE Linux is 4MB. Therefore, the default maximum size is 4MB * 65534 = 256 GB. Note that your filesystem will also need to support sizes as large as your volume.
What is the difference between physical and logical volume commands?
The physical volume commands are for adding or removing hard drives in volume groups. Volume group commands are for changing what abstracted set of physical partitions are presented to your operating in logical volumes. Logical volume commands will present the volume groups as partitions so that your operating system can use the designated space.
How to create a logical volume that uses the entire volume?
You can use -l argument of the lvcreate command to create a logical volume that uses the entire volume group. Another way to create a logical volume that uses the entire volume group is to use the vgdisplay command to find the “Total PE” size and to use those results as input to the lvcreate command.
What is a logical volume group in Linux?
A physical disk is divided into one or more physical volumes (Pvs), and logical volume groups (VGs) are created by combining PVs. One of the big advantages of LVM is that you can most easily reduce the size of one partition, and use it on other partitions for example, without data loss.
What is the default name for a logical volume?
If you do not specify a name for the logical volume, the default name lvol # is used where # is the internal number of the logical volume. When you create a logical volume, the logical volume is carved from a volume group using the free extents on the physical volumes that make up the volume group.