>What Is A Snapshot in lvm?

By | July 26, 2009


  • A snapshot is an operation in which we “freeze” the data on a logical volume, while still enabling writing new data.
  • This, of-course, is an oxymoron.
  • It is solved by splitting the data to old (written before taking the snapshot) and new (written after taking the snapshot).
  • The old data resides on the original logical volume.
  • The new data is written to a different disk.
  • When an application reads from the device, the underlying kernel code finds where lies the fresh copy of the data, and returns that to the application.
  • Meanwhile, we may mount the original (frozen) content on a different directory, and access it in read-only mode.
  • E.g. to backup the data.
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