On 5/29/19 5:40 AM, Konstantin Shalygin wrote: > block.db should be 30Gb or 300Gb - anything between is pointless. There > is described why: > http://lists.ceph.com/pipermail/ceph-users-ceph.com/2019-February/033286.html Following some discussions we had at the past Cephalocon I beg to differ on this point: when RocksDB needs to compact a layer it rewrites it *before* deleting the old data; if you'd like to be sure you db does not spill over to the spindle you should allocate twice the size of the biggest layer to allow for compaction. I guess ~60 GB would be the sweet spot assuming you don't plan to mess with size and multiplier of the rocksDB layers and don't want to go all the way to 600 GB (300 GB x2) regards, Mattia _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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