Customers can observe cluster issues when they use more than 90 percent of the total available storage on the cluster.  For node resiliency and redundancy, the disk usage must be below the Max Usable value.

One of the most common alerts is Cluster can not tolerate # node failure(s). This alert is fired by the NCC health check "sufficient_disk_space_check" that checks if there is sufficient storage space on the cluster to provide node resiliency.

See more details on  (KB 1863)

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