CS533 Concepts of Operating Systems

Class 18

File Systems

CS533 - Concepts of Operating Systems 2

Questions

What factors would influence the optimum block size for a file system?

Why has disk workload become write-dominated?

o What would be the disk workload if memory was free?

What “two” functions does the buffer-cache serve?

CS533 - Concepts of Operating Systems 3

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 4

Questions

What impact will the current rapid increase in disk capacity and decrease in cost per Mbyte have?

o 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?