HAMMER design document posted

Matthew Dillon is starting to commit parts of his HAMMER file system work; he anticipates it being available in beta form by the 2.0 release at the end of this year. He posted a design document, describing how it should work. Some highlights from my reading of it:

  • Maximum size: half an exabyte
  • Infinite snapshots, limited only by retention policy
  • Streaming backups
  • Asynchronous transactional support – no long fscks to check disk state

(Someone correct me if I’m summarizing inaccurately.) Some details from the ensuing discussion include comparisons with ZFS, RAID, and backups. KernelTrap also has a nice summary.

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