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CS533 Concepts of Operating Systems Class 19

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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CS533 Concepts of Operating Systems Class 19

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  1. CS533 Concepts of Operating SystemsClass 19 File System Reliability

  2. 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

  3. 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

  4. 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

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