Hi all, I have a theoretical question about Ceph. I've recently watched presentation here: http://www.slideshare.net/kioecn/build-an-highperformance-and-highdurable-block-storage-service-based-on-ceph and did not completely understood the idea behind slides #46-56.
In particular, if we have a pool consisting of 24 OSDs and 1 OSD is lost - how tuning CRUSH influences a recovery time in that case? I saw the optimized CRUSH map in the presentation (slide #55) but did not understand how osd domains and replica domains reduce the recovery time in comparison with the default map. Can someone explain me the idea please? Best Regards, Vasily
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