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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