I have worked with crush and crush rules a lot over the last 12 years. I would always recommend testing the rules with a crushtool, for example. https://docs.ceph.com/en/reef/man/8/crushtool/ joachim.kraftmayer@xxxxxxxxx www.clyso.com Hohenzollernstr. 27, 80801 Munich Utting | HR: Augsburg | HRB: 25866 | USt. ID-Nr.: DE275430677 Am Mi., 20. Nov. 2024 um 11:31 Uhr schrieb Janne Johansson < icepic.dz@xxxxxxxxx>: > > Sorry, sent too early. So here we go again: > > My setup looks like this: > > > > DC1 > > node01 > > node02 > > node03 > > node04 > > node05 > > DC2 > > node06 > > node07 > > node08 > > node09 > > node10 > > > > I want a replicated pool with size=4. Two copies should go in each DC, > > and then no two copies on a single node. > > How can I describe this in a crush rule? > > This post seem to show that, except they have their root named "nvme" > and they split on rack and not dc, but that is not important. > > > https://unix.stackexchange.com/questions/781250/ceph-crush-rules-explanation-for-multiroom-racks-setup > > with the answer at the bottom: > > for example this should work as well, to have 4 replicas in total, > distributed across two racks: > step take default class nvme > step choose firstn 2 type rack > step chooseleaf firstn 2 type host > > -- > May the most significant bit of your life be positive. > _______________________________________________ > ceph-users mailing list -- ceph-users@xxxxxxx > To unsubscribe send an email to ceph-users-leave@xxxxxxx > _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
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