100 TB from InfluxDB to Grafana Mimir

This blog is based on my work at CloudRaft!

Introduction

Observability is the backbone of any modern infrastructure, enabling organizations to monitor system health, optimize performance, and ensure seamless operations. However, when legacy observability systems reach their limits—whether due to scalability challenges, high costs, or lack of vendor support—businesses must pivot to more future-proof solutions.

The migration presented a unique set of challenges: handling seven years of monitoring data (roughly 100TB of uncompressed data), complex migration as there is no direct support to migrate from InfluxDB to Grafana Mimir, Grafana dashboards rewrite from InfluxQL to PromQL format for 100s of dashboards. In this blog, we’ll walk through the entire migration process, the challenges faced, and the architectural choices that enabled a seamless transition to Grafana Mimir.