Almacenamiento masivo

Almacenamiento masivo

1. Structure

   • Magnetic disks
     • seek time
     • latency rotational
   • Solid state disk
     • no seek time no rotational latency
   • Magnetic tape
     • "Permanent"
     • slow

2. addressed as 1- dimensional arrays

3. Storage array

   • replication
   • Duplication

4. Network attached storage

   • NFS
   • CIFS

5. Scheduling

   • OS maintains queue of request
   • FCFS
   • SSTF - Shortest seek time first
   • SCAN
   • C-SCAN
   • C-LOOK

6. Management

   • low-level formatting
   • Physical formatting

7. OS controls data structures

   • Partitions
   • Local formatting (file formatting)

8. Boot block - swap space

9. RAID

   • 1 - Mirroring
   • 0. Distibution
   • 1 + 0 Stripped mirrors
   • 0 + 1 Mirrored stripes
   • No prevent data corruption

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