Guys Thanks a lot for your response. We are running OpenStack Juno + Ceph 94.5
@Jason Dillaman Can you please explain what do you mean by "Glance is configured to cache your RBD image" ? This might give me some clue. Many Thanks. On Mon, Feb 8, 2016 at 10:33 PM, Jason Dillaman <dilla...@redhat.com> wrote: > If Nova and Glance are properly configured, it should only require a quick > clone of the Glance image to create your Nova ephemeral image. Have you > double-checked your configuration against the documentation [1]? What > version of OpenStack are you using? > > To answer your questions: > > > - From Ceph point of view. does COW works cross pool i.e. image from > glance > > pool ---> (cow) --> instance disk on nova pool > Yes, cloning copy-on-write images works across pools > > > - Will a single pool for glance and nova instead of separate pool . will > help > > here ? > Should be no change -- the creation of the clone is extremely lightweight > (add the image to a directory, create a couple metadata objects) > > > - Is there any tunable parameter from Ceph or OpenStack side that should > be > > set ? > I'd double-check your OpenStack configuration. Perhaps Glance isn't > configured with "show_image_direct_url = True", or Glance is configured to > cache your RBD images, or you have an older OpenStack release that requires > patches to fully support Nova+RBD. > > [1] http://docs.ceph.com/docs/master/rbd/rbd-openstack/ > > -- > > Jason Dillaman > > > ----- Original Message ----- > > > From: "Vickey Singh" <vickey.singh22...@gmail.com> > > To: ceph-users@lists.ceph.com, "ceph-users" <ceph-us...@ceph.com> > > Sent: Monday, February 8, 2016 9:10:59 AM > > Subject: [ceph-users] Tips for faster openstack instance boot > > > Hello Community > > > I need some guidance how can i reduce openstack instance boot time using > Ceph > > > We are using Ceph Storage with openstack ( cinder, glance and nova ). All > > OpenStack images and instances are being stored on Ceph in different > pools > > glance and nova pool respectively. > > > I assume that Ceph by default uses COW rbd , so for example if an > instance is > > launched using glance image (which is stored on Ceph) , Ceph should take > COW > > snapshot of glance image and map it as RBD disk for instance. And this > whole > > process should be very quick. > > > In our case , the instance launch is taking 90 seconds. Is this normal ? > ( i > > know this really depends one's infra , but still ) > > > Is there any way , i can utilize Ceph's power and can launch instances > ever > > faster. > > > - From Ceph point of view. does COW works cross pool i.e. image from > glance > > pool ---> (cow) --> instance disk on nova pool > > - Will a single pool for glance and nova instead of separate pool . will > help > > here ? > > - Is there any tunable parameter from Ceph or OpenStack side that should > be > > set ? > > > Regards > > Vickey > > > _______________________________________________ > > ceph-users mailing list > > ceph-users@lists.ceph.com > > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >
_______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
