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Ceph and immutable & append only storage
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The CEPH_OSD_ALLOC_HINT_FLAG_IMMUTABLE and CEPH_OSD_ALLOC_HINT_FLAG_APPEND_ONLY flags are set by rados bench via ALLOC_HINT_FLAG_IMMUTABLE and ALLOC_HINT_FLAG_APPEND_ONLY. It is used by BlueStore to decide on checksum and compression heuristics.

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dachary changed the task status from Open to Work in Progress.Feb 17 2021, 8:10 AM
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It was discussed, during the Ceph Developer Summit 2021 and the conclusion was that RADOS is not the place to implement immutable optimizations. RGW is a better fit.