Attempting to Improve Discard Performance | Ceph Days NYC 2024

While digging into RBD performance issues, it was observed that some fragmented OSDs were struggling to keep up with their normal performance, and they were struggling with their internal discard mechanism. Enabling discards in Ceph helped, but it still falls behind, as discards were single threaded. In this lightning talk, we'll discuss what DigitalOcean observed, and how we approached solutions by making discards multi-threaded, as well as limitations of certain nameless drives.