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Ceph Max Storage Capacity Calculator

Calculate the maximum storage usage of your Ceph cluster

Configuration

Nodes Configuration

Results

Total Raw Storage:

Maximum Recommended Usage:

Fault Tolerance

Node Fault Tolerance:

OSD Fault Tolerance:

Recommendations

  • Ensure that after node failures, enough capacity remains to avoid reaching the 'full ratio'.
  • For replication, the number of nodes should be greater than the replication factor.
  • For erasure coding, the number of nodes should be greater than k+m (data chunks + coding chunks).
  • Recovery performance depends on network and storage speed.
  • Note that after a node failure, rebalancing the cluster takes longer the larger the failed node is.