Right now, your only option is synchronous replication, which happens at the speed of the slowest OSD ... so unless your WAN links are fast and fat, it comes at non-negligible performance penalty. We will soon be sending out a proposal for an asynchronous replication mechanism with eventual consistency for the RADOS Gateway ... but that is a somewhat simpler problem (immutable objects, good change lists, and a WAN friendly protocol). Asynchronous RADOS replication is definitely on our list, but more complex and farther out. On 01/09/2013 01:19 PM, Gandalf Corvotempesta wrote:
probably this was already asked before but i'm unable to find any answer. Is possible to replicate a cluster geografically? GlusterFS does this with rsync (i think called automatically on every file write), does cheph do something similiar? I don't think that using multiple geographically distributed OSD with 10-15ms of latency will be good
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