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Tema 3 RAID


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Haremos un sencillo resumen de este tema de las oposiciones de técnico en informática de la Junta, destacando  tres puntos, conceptos, tipos de RAID, algunos RAID conocidos.

1 Conceptos relativos a RAID

  • RAID, Array redundante de Discos.
  • Hot Spare, disco de reserva.
  • Hot Swat, poder poner disco de reserva sin apagar.
  • Bandeado, Data striping.
  • Paridad, Forma de poner la redundancia.
  • Ventajas, Tolerancia a fallos, Velocidad, fiabilidad, Disponibilidad.

2 Tipos RAID

  • Hardware/Software.
  • Según cache, write Back, write throught.
  • Paralelos e independientes. Los paralelos dan mejor transferencia de datos y los independientes son mejores para las operaciones de E/S,

3 Algunos RAID conocidos

  • RAID 0, Bandeado, dos discos, sin redundancia, 100% de aprovechamiento.
  • RAID 1, Espejo, dos discos, 50% de aprovechamiento.
  • RAID 1+0, Bandeado+Espejo, cuatro discos, 50% de aprovechamiento.
  • RAID 3, Paralelo, x+1 disco para la paridad, mínimo 3 discos, 66/77% aprovechamiento. Información en bits.
  • RAID 5, Independiente, Información en bloques, paridad rotatoria, 3 unidades, 70% aprovechamiento.

Anterior: Tema 2 Arquitectura de la Memoria

Siguiente: Temas 4 y 5 Sistemas Operativos

Wiki Colaborativa con todos los temas de la Oposición

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