HCP System Management Help
The capacity balancing service has two main functions: detecting imbalances in storage availability across nodes and repairing those imbalances.
Detecting capacity imbalances
To detect imbalances in storage usage, the capacity balancing service compares node storage usage statistics.
Repairing capacity imbalances
If the capacity balancing service determines that storage usage is imbalanced across nodes:
1.The service determines whether the storage managed by each node is a source of objects to move or a target to move them to.
2.From the storage for each source node, the service moves objects one at a time to storage managed by a target node as long as these conditions apply:
oThe percent of space that’s free on the source node is less than or equal to the average percent of free space on all the nodes in the system.
oThe percent of space that’s free on the target node is greater than the average percent of free space on all the nodes in the system.
oThe storage managed by the target node doesn’t have a copy of the object to be moved.
When selecting objects to move, the capacity balancing service considers the size not only of the object data but also of any custom metadata the object includes.
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