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Maturity (n / 2) + 7

  • 2001: Development begun
  • 2004: First official announcement
  • 2005: Implemented in baseline Solaris
  • Jun 2007: Chris Mason announces btrfs to the kernel mailing list
  • Jan 2009: Implemented in baseline Linux kernel
  • Jan 2016: Still best considered “experimental” - strongly warned to VERIFY your backups, REGULARLY.