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CS533 Concepts of Operating Systems Class 18

CS533 Concepts of Operating Systems Class 18. File Systems. Questions. Why does read-optimized block placement perform very poorly for a write-dominated workload? How should free space be managed for a read-dominated workload? How should free space be managed for a write-dominated workload?.

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CS533 Concepts of Operating Systems Class 18

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  1. CS533 Concepts of Operating SystemsClass 18 File Systems

  2. Questions • Why does read-optimized block placement perform very poorly for a write-dominated workload? • How should free space be managed for a read-dominated workload? • How should free space be managed for a write-dominated workload? CS533 - Concepts of Operating Systems

  3. Questions • What impact will the current rapid increase in disk capacity and decrease in cost per Mbyte have? • What if disk space was free? • With intelligent disk controllers should the file system manage placement at all? • What issues should concern a file system designer, beyond performance? CS533 - Concepts of Operating Systems

  4. 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

  5. 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? CS533 - Concepts of Operating Systems

  6. What next? • Final will be a take home • Shouldn’t take more than a couple of hours CS533 - Concepts of Operating Systems

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