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CS533 Concepts of Operating Systems Class 19. File System Reliability. Questions. How do mirroring and RAID-5 increase the reliability of file data? What kinds of failures can be tolerated? Why might you choose mirroring over RAID-5? Why might you choose RAID-5 over mirroring?

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questions
Questions
  • How do mirroring and RAID-5 increase the reliability of file data?
    • What kinds of failures can be tolerated?
    • Why might you choose mirroring over RAID-5?
    • Why might you choose RAID-5 over mirroring?
  • If a storage device migrates blocks dynamically between mirrored and RAID-5 storage, how can file system software keep track of where data is?
  • If the storage system is log-structured, does the file system above it need to be log-structured?

CS533 - Concepts of Operating Systems

questions1
Questions
  • Need file system software above HP AutoRAID concern itself with free-space management?
  • Would the system benefit from using a device interface at a higher level of abstraction?
    • Why not implement the file abstraction at the device level?
    • Why not implement versioning at the device level?
    • How can disk blocks be shared among versions of the same file?
  • How can useful patterns and relationships be communicated from application to device level?

CS533 - Concepts of Operating Systems

what next
What next?
  • No need to write reviews for the last set of papers!
  • Hand in your position papers next class
  • Final will be a take home
    • Shouldn’t take more than a couple of hours

CS533 - Concepts of Operating Systems