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Why does an MetroCluster have less space than a non-MetroCluster with the same components?

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Applies to

4 node MetroCluster

Answer

  • A 4 node MetroCluster will use roughly 1/4th of the drives for storage
    • MetroCluster storage supports 4 nodes while a non MetroCluster HA pair only supports two
      • This will reduce available drives by half
    • MetroCluster storage uses mirroring which will use twice the disks with no additional space for the aggregates
      • This will reduce the available drives by half
  • Since there are fewer drives available for storage per node, there will be a higher percentage of parity drives than a non MetroCluster HA pair
  • MetroCluster systems have aggregate snapshots turned on to account for mirroring
    • The default snapshot reserve is 5% and will be unavailable for data storage

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