Can you describe your question little bit more for us? I'm not sure what you are asking? Splunk can ingest more than PB per day. It just depends on how environment has build and what are it's capacity. Data are stored into buckets on local disks or on S3 bucket e.g. in AWS or equivalent versions on GCP, Azure or onprem. All those are described on docs.splunk.com. If needed you can contact to your local Splunk Partner or directly to Splunk and they can present it to you. There are lots of videos, conf presentations etc. to tell more about Splunk.
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