On Wed, Apr 19, 2017 at 1:26 PM, Pavel Shub <pavel@xxxxxxxxxxxx> wrote: > Hey All, > > I'm running a test of bluestore in a small VM and seeing 2x overhead > for each object in cephfs. Here's the output of df detail > https://gist.github.com/pavel-citymaps/868a7c4b1c43cea9ab86cdf2e79198ee > > This is on a VM with all daemons & 20gb disk, all pools are of size 1. > Is this the expected amount of overhead per object? Is there anyway to > tweak bluestore settings? You're going to need to be clearer about what you mean by 2x overhead. Bluestore itself has a minimum size beneath which it will journal objects and then copy them into place, which might be considered 2x overhead. If you're talking about total number of cluster-wide disk ops, there's also a CephFS log which journals metadata updates that get flushed out to backing objects later, which might be considered 2x overhead. But I don't know what you mean just based on a ceph df. :) -Greg _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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