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 <dillaman@xxxxxxxxxx> 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.singh22693@xxxxxxxxx>
> To: ceph-users@xxxxxxxxxxxxxx, "ceph-users" <ceph-users@xxxxxxxx>
> Sent: Monday, February 8, 2016 9:10:59 AM
> Subject: 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
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