Yes, it's a general solution for any read-only parent images. This will *not* help localize reads for any portions of your image that have already been copied-on-written from the parent image down to the cloned image (i.e. the Cinder volume or Nova disk). On Wed, Apr 5, 2017 at 10:25 AM, Alejandro Comisario <alejandro@xxxxxxxxxxx> wrote: > 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_dillingham@xxxxxxxxxxx> 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 <jdillama@xxxxxxxxxx> 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.andrus@xxxxxxxxxxxxx> >>> 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 <jdillama@xxxxxxxxxx> >>> > 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 >>> >> <alejandro@xxxxxxxxxxx> wrote: >>> >> > any experiences ? >>> >> > >>> >> > On Wed, Mar 29, 2017 at 2:02 PM, Alejandro Comisario >>> >> > <alejandro@xxxxxxxxxxx> 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@xxxxxxxxxxxxxx >>> >> > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >>> >> >>> >> >>> >> >>> >> -- >>> >> Jason >>> >> _______________________________________________ >>> >> ceph-users mailing list >>> >> ceph-users@xxxxxxxxxxxxxx >>> >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >>> > >>> > >>> > >>> > >>> > -- >>> > Brian Andrus | Cloud Systems Engineer | DreamHost >>> > brian.andrus@xxxxxxxxxxxxx | www.dreamhost.com >>> >>> >>> >>> -- >>> Jason >>> _______________________________________________ >>> ceph-users mailing list >>> ceph-users@xxxxxxxxxxxxxx >>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >> >> >> >> >> -- >> Respectfully, >> >> Wes Dillingham >> wes_dillingham@xxxxxxxxxxx >> Research Computing | Infrastructure Engineer >> Harvard University | 38 Oxford Street, Cambridge, Ma 02138 | Room 210 >> >> >> _______________________________________________ >> ceph-users mailing list >> ceph-users@xxxxxxxxxxxxxx >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >> > > > > -- > Alejandrito -- Jason _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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