ceph
Ceph in Production: RBD, RGW and CephFS
A field guide to Ceph in production: which surface serves which workload, what failure domains cost in replicas, how the upgrade lifecycle really rolls back, and what key rotation does not do.
object storage
Object Storage for Data Platforms at Scale
Size an object store against bytes, object metadata, request demand and maintenance time. A practical worksheet for small files, retention, erasure coding and release-channel choices.
MinIO
MinIO delete-marker convergence: how the Silo fork fixed the 405 replication loop
The 405 storm had three root defects in the delete-marker path. PR #162 fixed the first attempt; PR #184 fixes retries, purge status and MRF healing in the Silo fork.
MinIO
MinIO Community in Production: Assess the Risk You Are Running
MinIO Community Edition has had no release since October 2025 and the repository is archived. Three CVEs will never be patched there. Here is how to assess what your cluster is actually exposed to, and where the maintained community fork fits in.
MinIO
MinIO site replication bug: how 684 million HTTP 405s exposed the delete-marker loop
HEAD probes on delete markers answer 405 and replication counts that as success. 20M stuck versions turned the loop into 684M useless requests in 48 h.
MinIO
MinIO Replication Drops Objects Into a Counter Nobody Reads
During a MinIO replication incident three of the signals you reach for mislead you. The 405 on HeadObject is the success path, a retried 429 is invisible, and worker queue overflow logs nothing under the default priority. The counter that tracks dropped objects is incremented in four places and read in none.
ceph
Ceph CVEs: auth service entities with insecure key types
Ceph 20.2.4 and 19.2.6 patch four authentication and authorization CVEs. The remediation also needs CephX key rotation, client checks, and RGW multisite planning.
object storage
Why File Count Matters as Much as File Size on Object Storage
Compression, object population and request count measure different things. Compare point-cloud packaging, range reads, update costs and cleanup with an explicit synthetic sizing example.
MinIO
MinIO Site Replication: Sync Mode Will Not Save Your RPO
A successful source PUT does not establish a recoverable peer copy. Separate MinIO site-replication acknowledgment, persisted retry state and catch-up capacity before committing to an RTO or RPO.
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.