Hi Andras, From what I can tell you can run crushtool with --test http://docs.ceph.com/docs/master/man/8/crushtool/ (https://link.getmailspring.com/link/[email protected]/0?redirect=http%3A%2F%2Fdocs.ceph.com%2Fdocs%2Fmaster%2Fman%2F8%2Fcrushtool%2F&recipient=Y2VwaC11c2Vyc0BsaXN0cy5jZXBoLmNvbQ%3D%3D) http://cephnotes.ksperis.com/blog/2015/02/02/crushmap-example-of-a-hierarchical-cluster-map (https://link.getmailspring.com/link/[email protected]/1?redirect=http%3A%2F%2Fcephnotes.ksperis.com%2Fblog%2F2015%2F02%2F02%2Fcrushmap-example-of-a-hierarchical-cluster-map&recipient=Y2VwaC11c2Vyc0BsaXN0cy5jZXBoLmNvbQ%3D%3D) David Majchrzak CTO ODERLAND Webbhotell AB E // [email protected] (https://link.getmailspring.com/link/[email protected]/2?redirect=mailto%3Adavid%40oderland.se&recipient=Y2VwaC11c2Vyc0BsaXN0cy5jZXBoLmNvbQ%3D%3D) P // +46.313616161 (tel:+46.313616161) A // Östra Hamngatan 50B, 411 09 Göteborg (https://link.getmailspring.com/link/[email protected]/3?redirect=https%3A%2F%2Fmaps.google.com%2F%3Fq%3D%25C3%2596stra%2520Hamngatan%252050B&recipient=Y2VwaC11c2Vyc0BsaXN0cy5jZXBoLmNvbQ%3D%3D) W // https://www.oderland.se (https://link.getmailspring.com/link/[email protected]/4?redirect=https%3A%2F%2Fwww.oderland.se&recipient=Y2VwaC11c2Vyc0BsaXN0cy5jZXBoLmNvbQ%3D%3D)
On aug 6 2018, at 1:56 pm, Andras Pataki <[email protected]> wrote: > > Hi cephers, > Is there a way to see what a crush map change does to the PG mappings > (i.e. what placement groups end up on what OSDs) without actually > setting the crush map (and have the map take effect)? I'm looking for > some way I could test hypothetical crush map changes without any effect > on the running system. > > Andras > _______________________________________________ > ceph-users mailing list > [email protected] > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >
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