On Wed, Jun 8, 2016 at 8:22 AM, George Shuklin <george.shuk...@gmail.com> wrote: > Hello. > > Can someone help me to see difference between step choose and step > chooseleaf in CRUSH map?
When you run "choose" on a CRUSH bucket type, it selects CRUSH bucket nodes of that type. If you run chooseleaf, it selects leaf nodes underneath that bucket type (ie, it goes all the way down the tree to picking specifics OSDs). If you're doing a simple map where you want to separate all copies across racks, or OSDs, or whatever, it's generally best to just use chooseleaf on your failure domain. If you're trying to do something more complicated like run 2x2 or something, you'll want to choose your way down to the split points and then run chooseleaf to go the rest of the way. -Greg _______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
