> By now we decide use a SuperMicro's SKU with 72 bays for HDD = 22 SSD + > 50 SATA drives. > Our racks can hold 10 this servers and 50 this racks in ceph cluster = > 36000 OSD's, > With 4tb SATA drives and replica = 2 and nerfull ratio = 0.8 we have 40 > Petabyte of useful capacity. > > It's too big or normal use case for ceph? I'm a bit worried about the replica count: The chances of 2 disks failing of 25000 at the same time becomes very significant. (or a disk + server failure) Without doing any math my gut feeling says that 3 replica's is still not very comfortable. (especially if the disks come from the same batch) Cheers, Robert van Leeuwen _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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