The stack

At the end of this chapter, we will have a software stack that looks like the following:

Each of the following layers represents one enhancement necessary for the best long-term high availability:

  • The first LVM layer (starting at the storage) protects DRBD from inheriting device-specific block sizes and allows for online resizing or migration to new devices
  • The DRBD layer replicates data to another server for immediate use
  • The second LVM layer provides snapshot capabilities and other potentially useful LVM functionality to the filesystem
  • The XFS layer is the last element where data resides and is available for direct manipulation ...

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