Data rebalancing
Splunk creates primary buckets on the indexers receive data from the forwarders that are sending data to that indexer at the time, and distributes replicated buckets across an indexing tier based on bucket counts, not index size. Therefore, it is possible that over time, the disk usage across all, your indexers will differ significantly, and may cause some disks to get too close to full for comfort. If this is the case, you may need to perform a data rebalance across your indexing tier. This is performed from the Cluster Master.
Although you can execute and monitor a data rebalance from the Splunk CLI, I recommend doing so from the Cluster Master GUI so that you can more easily monitor the rebalance progress. Click Settings ...
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