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This board has slots for 6 Raspberry Pi CM4s, and on the back, 6 NVMe SSDs (one attached directly to each Pi). Setting up Ceph was a lot easier than I thought it'd be, though I used some Ansible playbooks to glue everything together.
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InfluxDB
Purpose built for real-time analytics at any scale. InfluxDB Platform is powered by columnar analytics, optimized for cost-efficient storage, and built with open data standards.
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There's also a GitHub issue with a ton more detail about the chips used, and usage notes from a few different people.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.