Ozone cluster (physical) capacity

The Cluster widget provides a high-level summary of the total physical storage managed by Ozone DataNodes. It helps you distinguish between space used by Ozone versus space consumed by other processes on the underlying hardware.

Figure 1. Ozone cluster physcial capacity

The Cluster widget displays the following metrics:

Total capacity: The combined usable storage space across all configured directories on live DataNodes, calculated after subtracting reserved file system space.
Ozone used space: The physical disk space currently occupied by replicated Ozone blocks.
note
This Ozone used space accounts for your replication factor configuration. For example, a 100 GB key with 3x replication consumes 300 GB of physical space.
Other used space: Storage consumed by internal Ozone system files rather than actual user data. This includes logs, configuration files, RocksDB files and so on.
Container pre-allocated: Space reserved temporarily for open containers that have been allocated to clients but not yet fully written to. This reserved space decreases as data is written, and any remaining unused space is released when the container is closed.
Remaining space: The actual amount of unused physical disk space currently available for new Ozone data.