15 Architectural Decisions Series: Controller Architecture and Limited Error Paths

Our series around Pure's fundamental design princ…

An episode of the The Pure Report podcast, hosted by Pure Storage, titled "15 Architectural Decisions Series: Controller Architecture and Limited Error Paths" was published on August 12, 2025 and runs 33 minutes.

August 12, 2025 ·33m · The Pure Report

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Summary

Our series around Pure's fundamental design principles continues. Episode 3 discusses three key architectural decisions: stateless controllers, the second controller, and limited error paths. Hear from co-hosts JD Wallace and Andrew Miller about how stateless controllers mean no identity or state is stored within the controller itself, allowing for easy replacement and upgrades without downtime. This design philosophy simplifies maintenance, reduces support costs, and enables seamless technology migrations, allowing Pure customers to upgrade hardware generations without impacting business operations. This is a significant shift from older storage array methods that required complex, time-consuming manual processes and often led to downtime. We then further explore the strategic decision behind having a second controller in an active-standby configuration, prioritizing consistent performance and uptime over maximizing raw performance from both controllers simultaneously. This approach ensures that performance remains stable even during failovers or planned upgrades, eliminating unpredictable results and reducing the need for constant monitoring by IT admins. By focusing on reliability and simplicity, Pure Storage aims to provide a "cloud-like" experience for on-prem and cloud connected storage, significantly reducing operational complexity and enabling faster adoption of new technologies and features. The Pure Report podcast is now available on video - bookmark the playlist at https://www.youtube.com/playlist?list=PL5d3ZupjTzE150O6sjbVLhrAP3kpC1QEm

Episode Description

Our series around Pure's fundamental design principles continues. Episode 3 discusses three key architectural decisions: stateless controllers, the second controller, and limited error paths. Hear from co-hosts JD Wallace and Andrew Miller about how stateless controllers mean no identity or state is stored within the controller itself, allowing for easy replacement and upgrades without downtime. This design philosophy simplifies maintenance, reduces support costs, and enables seamless technology migrations, allowing Pure customers to upgrade hardware generations without impacting business operations. This is a significant shift from older storage array methods that required complex, time-consuming manual processes and often led to downtime. We then further explore the strategic decision behind having a second controller in an active-standby configuration, prioritizing consistent performance and uptime over maximizing raw performance from both controllers simultaneously. This approach ensures that performance remains stable even during failovers or planned upgrades, eliminating unpredictable results and reducing the need for constant monitoring by IT admins. By focusing on reliability and simplicity, Pure Storage aims to provide a "cloud-like" experience for on-prem and cloud connected storage, significantly reducing operational complexity and enabling faster adoption of new technologies and features. The Pure Report podcast is now available on video - bookmark the playlist at https://www.youtube.com/playlist?list=PL5d3ZupjTzE150O6sjbVLhrAP3kpC1QEm

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