I am trying to learn about Ceph and have
been looking at the documentation and speaking to colleagues who work with it and had a question that I could not get the answer to. As I understand it, the Crush map is updated every time a disk is added. This causes the OSDs to migrate their data in placement groups to new OSDs. During that time, is the data on the old OSDs accessible for reads?
E.g if I have 2 copies on OSD-x and OSD-y. If OSD-x fails, while OSD-y is migrating to OSD-z, will the system fall back to OSD-y or will I get a read error, and would I have to retry the read after the migration?
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