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What are logical volume manager and its requirements on Linux servers?

Answer»

LVM is a short form of logical volume manager requires to resize filesystem size. This size of LVM can be extended and reduced using lvextend and lvreduce command respectively.  We can think of LVM as dynamic partitions, meaning that we can create/resize/delete LVM partitions from the command line while our Linux system is running: here is no need to reboot the systems to MAKE kernel aware of the newly-created or resized partitions.

LVM provided functions:

  • A logical drive can EXTEND over more than one hard-disk. They are not limited by the size of one single disk, rather by the total aggregate in size.
  • LVM can be used to create a (read-only) snapshot of any LV (Logical Volume). You can revert the original LV to the snapshot at a later time, or delete the snapshot if you no longer need it.
  • LVM also supports writeable snapshots. LVM allows FREEZING an EXISTING Logical Volume in time, at any moment, even while the system is running.


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