On Sun, 30 Dec 2018, David C wrote: > Hi All > > I'm trying to set the existing pools in a Luminous cluster to use the hdd > device-class but without moving data around. If I just create a new rule > using the hdd class and set my pools to use that new rule it will cause a > huge amount of data movement even though the pgs are all already on HDDs. > > There is a thread on ceph-large [1] which appears to have the solution but > I can't get my head around what I need to do. I'm not too clear on which > IDs I need to swap. Could someone give me some pointers on this please? > > [1] > http://lists.ceph.com/pipermail/ceph-large-ceph.com/2018-April/000109.html > This is a new feature in crushtool in master that will be included in nautilus. You can either wait, or you can just build nautilus from source (or grab a recent package from shaman.ceph.com) and use the crushtool CLI to update your crushmap. See http://docs.ceph.com/docs/master/rados/operations/crush-map-edits/#crush-reclassify s _______________________________________________ Ceph-large mailing list Ceph-large@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-large-ceph.com
