Dear all, we're planning a new Ceph-Clusterm, with CephFS as the main workload, and would like to use erasure coding to use the disks more efficiently. Access pattern will probably be more read- than write-heavy, on average. I don't have any practical experience with erasure- coded pools so far. I'd be glad for any hints / recommendations regarding these questions: * Is an SSD cache pool recommended/necessary for CephFS on an erasure-coded HDD pool (using Ceph Luminous and BlueStore)? * What are good values for k/m for erasure coding in practice (assuming a cluster of about 300 OSDs), to make things robust and ease maintenance (ability to take a few nodes down)? Is k/m = 6/3 a good choice? * Will it be sufficient to have k+m racks, resp. failure domains? Cheers and thanks for any advice, Oliver _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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