I am using the Ceph C api to create and update Ceph objects and their respective omaps and xattributes. I have two requirements:
1. Write operations must be written atomically such that either all updates to an object complete, or, all updates to the object fail. If even one update fails then the object remains unchanged. 2. Simultaneously, I need to be assured that all writes have been persisted to disk on at least two of three replicas. I see that there are methods to read/write atomically, and there are methods for synchronous writes with completion callbacks, but is there a mechanism for doing both a the same time. Am I overlooking anything? Will any of the flush_cache calls provide the guarantee I'm looking for? Steven Paster Platform Architect Actiance Corp.
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