Another thing that i would love to ask and clarify is, would this work for openstack vms that uses cinder, instead of vms that uses direct integration between nova and ceph ? We use cinder bootable volumes and normal cinder attached volumes to vms.
thx On Wed, Apr 5, 2017 at 10:36 AM, Wes Dillingham <wes_dilling...@harvard.edu> wrote: > This is a big development for us. I have not heard of this option either. I > am excited to play with this feature and the implications it may have in > improving RBD reads in our multi-datacenter RBD pools. > > Just to clarify the following options: > "rbd localize parent reads = true" and "crush location = foo=bar" are > configuration options for the client's ceph.conf and are not needed for OSD > hosts as their locations are already encoded in the CRUSH map. > > It looks like this is a pretty old option ( > http://narkive.com/ZkTahBVu:5.455.67 ) > > so I am assuming it is relatively tried and true? but I have never heard of > it before... is anyone out there using this in a production RBD environment? > > > > > On Tue, Apr 4, 2017 at 7:36 PM, Jason Dillaman <jdill...@redhat.com> wrote: >> >> AFAIK, the OSDs should discover their location in the CRUSH map >> automatically -- therefore, this "crush location" config override >> would be used for librbd client configuration ("i.e. [client] >> section") to describe their location in the CRUSH map relative to >> racks, hosts, etc. >> >> On Tue, Apr 4, 2017 at 3:12 PM, Brian Andrus <brian.and...@dreamhost.com> >> wrote: >> > Jason, I haven't heard much about this feature. >> > >> > Will the localization have effect if the crush location configuration is >> > set >> > in the [osd] section, or does it need to apply globally for clients as >> > well? >> > >> > On Fri, Mar 31, 2017 at 6:38 AM, Jason Dillaman <jdill...@redhat.com> >> > wrote: >> >> >> >> Assuming you are asking about RBD-back VMs, it is not possible to >> >> localize the all reads to the VM image. You can, however, enable >> >> localization of the parent image since that is a read-only data set. >> >> To enable that feature, set "rbd localize parent reads = true" and >> >> populate the "crush location = host=X rack=Y etc=Z" in your ceph.conf. >> >> >> >> On Fri, Mar 31, 2017 at 9:00 AM, Alejandro Comisario >> >> <alejan...@nubeliu.com> wrote: >> >> > any experiences ? >> >> > >> >> > On Wed, Mar 29, 2017 at 2:02 PM, Alejandro Comisario >> >> > <alejan...@nubeliu.com> wrote: >> >> >> Guys hi. >> >> >> I have a Jewel Cluster divided into two racks which is configured on >> >> >> the crush map. >> >> >> I have clients (openstack compute nodes) that are closer from one >> >> >> rack >> >> >> than to another. >> >> >> >> >> >> I would love to (if is possible) to specify in some way the clients >> >> >> to >> >> >> read first from the nodes on a specific rack then try the other one >> >> >> if >> >> >> is not possible. >> >> >> >> >> >> Is that doable ? can somebody explain me how to do it ? >> >> >> best. >> >> >> >> >> >> -- >> >> >> Alejandrito >> >> > >> >> > >> >> > >> >> > -- >> >> > Alejandro Comisario >> >> > CTO | NUBELIU >> >> > E-mail: alejandro@nubeliu.comCell: +54 9 11 3770 1857 >> >> > _ >> >> > www.nubeliu.com >> >> > _______________________________________________ >> >> > ceph-users mailing list >> >> > ceph-users@lists.ceph.com >> >> > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >> >> >> >> >> >> >> >> -- >> >> Jason >> >> _______________________________________________ >> >> ceph-users mailing list >> >> ceph-users@lists.ceph.com >> >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >> > >> > >> > >> > >> > -- >> > Brian Andrus | Cloud Systems Engineer | DreamHost >> > brian.and...@dreamhost.com | www.dreamhost.com >> >> >> >> -- >> Jason >> _______________________________________________ >> ceph-users mailing list >> ceph-users@lists.ceph.com >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > > > > -- > Respectfully, > > Wes Dillingham > wes_dilling...@harvard.edu > Research Computing | Infrastructure Engineer > Harvard University | 38 Oxford Street, Cambridge, Ma 02138 | Room 210 > > > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > -- Alejandrito _______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
