3 Search Heads, 21 Indexers, Total Users: up to 48
2 to 3TB/day
https://docs.splunk.com/Documentation/Splunk/7.2.3/Capacity/Summaryofperformancerecommendations
Lets assume, 20 indexers can index 3 TB (approx 500/3=165.. 165*20=3300 )
3300 indexers required to index 500TB data per day.
for 500TB per day requirement, you can contact Splunk Sales, they would help you in designing and deployment of this requirement.
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