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capacity planning

Audio waveform processed by a local GPU into structured transcript files
AI

Transcribe 100 Hours of Podcasts with whisper.cpp

I used whisper.cpp on an RTX 5070 to transcribe about 100 hours of podcasts in roughly three hours, then turned the Markdown output into a searchable prompt knowledge base.

By Julien Laurenceau, 3 hours2026-08-04 ago
Two panels. Top: a single MinIO bucket overflowing with small files, a worried Tux, and a dead directory tree on a tombstone. Bottom: the same objects split across four prefix-partitioned buckets under separate folders, with a healthy green directory tree.
MinIO

MinIO on XFS: Inode Exhaustion and Prefix Design for Lots of Small Files

MinIO has no NameNode. It puts the namespace on XFS as real directories and xl.meta files. On Lots of Small Files that means you can exhaust inodes while df -h still looks fine, and a flat leaf can stall PUT, LIST, scanner, and ILM together. Here is the on-disk model, the inode math, and a prefix recipe that keeps XFS inside a regime you can operate.

By Julien Laurenceau, 1 week2026-07-27 ago
Abstract grid of glowing compute cells densely packed into reserved cluster capacity
apache spark

Spark on Kubernetes Reserves CPU It Never Uses. Here’s the Overcommit Fix.

Spark sets executor CPU requests equal to limits, so a Kubernetes cluster reserves twice the CPU it uses and refuses to schedule pending pods. Kubernetes has no native overcommit. Here is the mutating-webhook operator I use to fix it.

By Julien Laurenceau, 2 months2026-05-31 ago
data

The Hidden Costs of Using HDDs in On-Premises MinIO Deployments

Bring the IOPS dude ! As a solutions architect working with MinIO storage solutions, I’ve seen firsthand the challenges that come with on-premises deployments using hard disk drives (HDDs). While HDDs may seem like a cost-effective option initially, they can introduce significant performance bottlenecks that impact the overall efficiency and Read more

By Julien Laurenceau, 8 months2025-12-15 ago
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