/tags/storage/Recent content in Storage on Momo Engineering Journal/images/og-image.png/images/og-image.pngHugoen-usWed, 21 Oct 2026 11:26:56 -0600/posts/055-adaptive-volume-storage/Tue, 06 Oct 2026 02:44:44 +0000/posts/055-adaptive-volume-storage/Why millions of small files per directory collapse a filesystem, and how a SeaweedFS-style volume layout fixes it: append-only superblocks, 8-byte-aligned needles with CRC32C frames, hole-punching deletion, and crash recovery by truncation. Teaches: the real cost of per-blob files, why alignment beats variable-length framing, and how to make crash recovery O(1)./posts/022-momofs-posix-core/Thu, 27 Aug 2026 22:40:31 +0000/posts/022-momofs-posix-core/The R4 POSIX core: inodes as content-addressed manifests, files as blobs, atomic rename, hardlinks, permission enforcement — a filesystem on momo./posts/043-reduce-read-verify-hashing/Wed, 26 Aug 2026 19:00:59 +0000/posts/043-reduce-read-verify-hashing/Verify-on-read re-hashes the full object on every local read (~8x slower than write). A ReadVerifier seam skips re-verification for blobs verified this process, while scrub still catches bitrot./posts/031-core-integrity-verification/Mon, 24 Aug 2026 18:03:31 +0000/posts/031-core-integrity-verification/S3 integrity checksums moved from a surface-level adapter into the storage/ingest core via a protocol-agnostic ChecksumProvider seam — every write path verified, replicas re-verify on receive./posts/006-pluggable-storage-backends/Sun, 26 Jul 2026 14:33:59 +0000/posts/006-pluggable-storage-backends/The <code>[storage] backend</code> seam swaps blob storage (local, nfs, s3, raw) behind one Store interface, keeping CAS metadata local./posts/004-cas-content-addressable-store/Wed, 11 Mar 2026 14:34:18 +0000/posts/004-cas-content-addressable-store/Identify every object by its SHA-256 content hash — server-side dedup, verify-on-read, and a path that later mounted a filesystem. Teaches: content addressing principles, single write chokepoint, Bolt/Sentinel patterns.