# I/O Shaping in EOS

- Institution: CERN
- Speaker: Luis Antonio Obis Aparicio
- Year: 2026
- Language: English
- Source: [CERN](https://videos.cern.ch/record/3023537)
- Licence: [CERN](https://copyright.web.cern)
- Who can watch: Teens profiles and older (sources give no ratings; placed by Invisible Network from the source's own words)

**I/O shaping** in EOS is a cluster-wide mechanism that helps share storage bandwidth fairly across a whole instance. It continuously collects near-real-time I/O activity from all nodes and builds a global picture of who is reading and writing - grouped by user, group, or application. Using this global view, EOS can automatically apply scheduling and priority rules that decide how the available I/O capacity is shared.

Unlike local throttling on a single machine, global I/O shaping coordinates decisions across the entire system. This prevents one heavy consumer from slowing everyone else down and keeps latency stable when different workloads run at the same time. Administrators can prioritize critical workloads, guarantee minimum throughput for selected users, or limit overly aggressive activity, all while keeping overall throughput high. The result is more predictable performance and better sharing of storage resources without requiring changes in applications.

We will present a report on its current status and the technical aspects of its implementation.

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## Lectures

1. [I/O Shaping in EOS](https://invisiblenetwork.ai/learn/cern/3023537/c061f13f30dd), 26 min (CERN's player)