Hi Patrick On Fri, May 18, 2018 at 6:20 PM Patrick Donnelly <pdonn...@redhat.com> wrote:
> Each MDS may have multiple subtrees they are authoritative for. Each > MDS may also replicate metadata from another MDS as a form of load > balancing. Ok, its good to know that it actually does some load balance. Thanks. New question: will it make any difference in the balancing if instead of having the MAIL directory in the root of cephfs and the domains's subtrees inside it, I discard the parent dir and put all the subtress right in cephfs root? > standby-replay daemons are not available to take over for ranks other > than the one it follows. So, you would want to have a standby-replay > daemon for each rank or just have normal standbys. It will likely > depend on the size of your MDS (cache size) and available hardware. > > It's best if y ou see if the normal balancer (especially in v12.2.6 > [1]) can handle the load for you without trying to micromanage things > via pins. You can use pinning to isolate metadata load from other > ranks as a stop-gap measure. > Ok I will start with the simplest way. This can be changed after deployment if it comes to be the case. On Fri, May 18, 2018 at 6:38 PM Daniel Baumann <daniel.baum...@bfh.ch> wrote: > jftr, having 3 active mds and 3 standby-replay resulted May 20217 in a > longer downtime for us due to http://tracker.ceph.com/issues/21749 > > we're not using standby-replay MDS's anymore but only "normal" standby, > and didn't have had any problems anymore (running kraken then, upgraded > to luminous last fall). > Thank you very much for your feedback Daniel. I'll go for the regular standby daemons, then. Regards, Webert Lima DevOps Engineer at MAV Tecnologia *Belo Horizonte - Brasil* *IRC NICK - WebertRLZ*
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