At Mon, 31 Oct 2011 09:07:25 -0000, Matthew Law wrote: > > On Mon, October 31, 2011 2:17 am, Miles Fidelman wrote: > > Something that's not quite obvious from the documentation: > > > > How does Sheepdog spread blocks around when nodes have multiple disks? > > For example, on a 4-node cluster, where each node has 4 drives, is > > Sheepdog smart enough to replicate blocks in ways that protect against > > both individual drive failures, and node failures that take out 4 drives > > at a time? > > Hi Miles, > > my understanding of sheepdog is that one would normally run a sheep daemon > per logical disk. My testing has been by running a single sheep daemon > per linux md raid 10 device. This is obviously overkill but suited my > setup and sheepdog's features at the time. > > The better solution for current sheepdog is to run one sheep daemon per > disk and use the failure zones which were recently introduced to tell > sheepdog 'where' the disks live so it does not place all copies of a block > of data on a single physical server.
Yes, and Sheepdog uses the same zone id in the same node by default; dada will be replicated across nodes without any configuration. Thanks, Kazutaka -- sheepdog mailing list [email protected] http://lists.wpkg.org/mailman/listinfo/sheepdog
