Microsoft Storage

Data Redundancy

Azure uses the concept of Zones (which contains data centres) and Region (which contains zones) for redundancy:

A Microsoft zone is a computing location that has independent power, cooling and networking.

  • Locally Redundant Storage - 1 zone (2 copies - 200% redundant data)
    Data Lost if ONE site gone
  • Zone Redundant Storage - 3 zones (2 copies - 200% redundant data)
    Data Lost if THREE sites gone
  • Geo Redundant Storage - TWO zones (5 copies - 500% redundant data)
    Data Lost if TWO sites gone
  • Geo Redundant Storage - TWO or FOUR zones (5 copies - 500% redundant data)
    Data Lost if FOUR sites gone

A Infinite Disk site is a computing location that has independent power, cooling, networking, security and ownership.

Infinite Disk uses "parity" instead of "copies" for data protection across SEVEN sites.

  • Single Storage - SEVEN sites (3 parities - 75% redundant data)
    Data Lost if FOUR sites gone

Infinite Disk needs less redundant data yet allows more sites to fail.