https://blogs.damiendye.uk/en/tags/croit/ Recent content in Croit on Damien Dye's Blog Hugo en-GB Wed, 11 Nov 2026 15:30:00 +0000 https://blogs.damiendye.uk/en/ceph/flashstore-against-crimson/ Wed, 11 Nov 2026 15:30:00 +0000 https://blogs.damiendye.uk/en/ceph/flashstore-against-crimson/ Ceph's own Crimson and croit's FlashStore both rewrite the OSD for NVMe. As Umbrella 21.2.0 ships Crimson: origin and status, memory safety, how each joins a cluster, why existing pools cannot move to Crimson, what it tells the monitor, cores, Crimson's default BlueStore, SeaStore's trees, commit order and cleaning, and what each runs on. https://blogs.damiendye.uk/en/ceph/flashstore-against-umbrella-bluestore/ Wed, 11 Nov 2026 14:30:00 +0000 https://blogs.damiendye.uk/en/ceph/flashstore-against-umbrella-bluestore/ croit's ceph-rust replaces ceph-osd and BlueStore with a Rust OSD and its own store. Compared against BlueStore as Ceph 21.2.0 Umbrella ships it: where metadata lives, the 4 KiB write and the sub-4 KiB overwrite, threads against cores, PLP, what it will not run on, reporting as BlueStore, and migration.