How are the blockSpace thresholds calculated for Element

blockSpace thresholds are calculated based on the following equations:

Total block capacity - (largest node capacity + 3 % of total block capacity) = Cluster error threshold
Cluster error threshold / Total block capacity = % at which the system generates the error message

Block capacity is obtained by API call GetClusterCapacity under maxUsedSpace
This can be consulted by the raw capacity per node type on What is the raw block and metadata capacity for SolidFire and H-Series nodes?

Example for five SF9605 nodes:

Total block capacity of five SF9605 nodes (5 x 8,640GB) = 43,200 GB
Largest node capacity = 8,640GB
3% of total block capacity (43,200GB x 0.03) = 1,296 GB
Applying these values to the formula, the following results are obtained:
- Total block capacity - (largest node capacity + 3 % of total block capacity) = Cluster error threshold
- Cluster error threshold / Total block capacity = % at which the system generates the error message
  - 43,200 - (8,640 + 1,296) = 33,264
  - 33,264 / 43,200 = .77 (or 77 %)

Interpret the results of the above example as follows:

A BlockClusterFull error code will appear when the cluster is 77% (33,264 GB) full
The system default for generating a warning severity message is 3% below the calculated error severity
- In this example, the system would generate a warning severity when the cluster is 74% full
To be notified with a warning severity message before the 74% threshold is reached:
- Specify the threshold percentage with the desired value on Cluster > Settings > Cluster Full Settings
Example:
- To receive a warning message at 10% below the error severity (77%):
  - Enter 10 in the Raise a warning alert when _ % capacity remains before Helix could not recover field
  - A warning severity alert will then be generated when 67% of the cluster is full