On Thu, May 4, 2017 at 5:30 AM Loic Dachary <l...@dachary.org> wrote:
> Hi, > > In a cluster where the failure domain is the host and dozens of hosts, the > 85% default for nearfull ratio is fine. A host failing won't suddenly make > the cluster 99% full. In smaller clusters, with 10 hosts or less, it is > likely to not be enough. And in larger clusters 85% may be too much to > reserve and 90% could be more than enough. > > Is there a way to calculate the optimum nearfull ratio for a given > crushmap ? Is failure recovery the primary concern with the nearfull flag? Best I can recall it was initially more about the CRUSH placement imbalance and preventing any one OSD from going actually full and halting the whole cluster. -Greg > > Cheers > > -- > Loïc Dachary, Artisan Logiciel Libre > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >
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