When I/O Workloads Don’t Perform

Every now and then, you find yourself in a situation where you expect better performance from your data storage drives. Either they once performed very well and one day just stopped, or they came straight out of the box underperforming. We explore a few of the reasons why this might happen.

By Petros Koutoupis

Updated Sep 18, 2026 4:24 PM / Published Aug 7, 2021 3:00 AM 27 min read

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Petros Koutoupis

Petros Koutoupis is a senior performance software engineer at Cray (now HPE) for its Lustre High Performance File System division. He is also the creator and maintainer of the RapidDisk Project [www.rapiddisk.org].