Practices of Ceph Object Storage in Public Cloud Services
summary
Three-city multi-site Ceph deployment for China Mobile runs a public object-cloud with regional metadata sync and over 15PB of raw capacity, using Ceph RGW/S3 extensions to ship bucket notification, request callback and object soft link plus a storage class feature that migrates objects between pools. Operational pain points are cluster expansion and rebalancing when adding pools or servers, heavy RGW/metadata contention at ~10k concurrent requests, and costly rebuilds of many RGW/credential modules for upgrades.
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