### [Storage Requirements](https://docs.splunk.com/Documentation/Splunk/9.3.0/Capacity/HowSplunkcalculatesdiskstorage)

```
 ( Daily average indexing rate ) x ( retention policy ) x 1/2
```

 #### [Parts of distributed splunk](https://docs.splunk.com/Documentation/Splunk/9.3.0/Capacity/Distributeindexingandsearching)
 - more indexers increase I/O capacity on disks

 #### [Capacity Planning](https://docs.splunk.com/Documentation/Splunk/9.3.0/Capacity/Accommodatemanysimultaneoussearches)