A distributed system is a

1
(No Transcript)
2

• A distributed
  system is a
• collection of
  machines
• sharing files and
  inde
• pendent storage
  resources
• Service is the specification of what the file
  system offers to its clients
• server service software running on a single
  machine
• client a process that can invoke a service
  using its client interface

3

• A distributed file
  system
• (DFS) should hide
  the
• multiplicity of its
  servers
• The most important measurement of a DFS is the
  amount of time needed to satisfy service requests
  (disk-access time, small amount of CPU-processing
  time the time to deliver the request and to get
  the response)

4

• Naming is a mapping between logical and physical
  objects. Two naming structures
• Users deal with logical data objects represented
  by file names. The system manipulates physical
  blocks of data stored on disk tracks

5

• Remote file access
• Remote service
• Caching (holding the most recently used files in
  the servers main memory)
• File replication
• Caching and replication are used to improve
• performance

6

• Remote file acces

7

• Remote file tkuyroiytouiytacces

8
(No Transcript)