Course notes on Multimedia Servers (Summary)

• special requirements: large storage, stream delivery or fast file delivery for a large number of users
• RAID disk arrays
• parallel architectures: many computers, each controlling a large number of disks, interconnected to users through high-speed network
• In case of streaming output:
  • need for output buffer (for smoothing out the media stream)
  • disk access scheduling with real-time deadlines
• Disk organization
  • data placement
    • contiguous data placement
    • scattered
  • disk scheduling (see slides by Dr. El Saddik)
    • traditional: Scan algorithm
    • earliest deadline first (EDF)
    • Scan-EDF
    • group sweeping