Hi! How big are the actual image files? Because qcow2 is a sparse format, it does not store zeroes. If the free space in one image is zeroed out, it will convert much faster. If that is the problem, use „dd if=/dev/zero of=temp;sync;rm temp“ or zerofree.
Tomas From: Paras pradhan [mailto:pradhanpa...@gmail.com] Sent: Monday, July 31, 2017 11:54 PM To: openstack-operators@lists.openstack.org Subject: [Openstack-operators] custom build image is slow Hello I have two qcow2 images uploaded to glance. One is CentOS 7 cloud image downloaded from centos.org. The other one is custom built using CentOS 7.DVD. When I create cinder volumes from them, volume creation from the custom built image it is very very slow. CenOS qcow2: 2017-07-31 21:42:44.287 881609 INFO cinder.image.image_utils [req-ea2d7b12-ae9e-45b2-8b4b-ea8465497d5a e090e605170a778610438bfabad7aa7764d0a77ef520ae392e2b59074c9f88cf 490910c1d4e1486d8e3a62d7c0ae698e - d67a18e70dd9467db25b74d33feaad6d default] Converted 8192.00 MB image at 253.19 MB/s Custom built qcow2: INFO cinder.image.image_utils [req-032292d8-1500-474d-95c7-2e8424e2b864 e090e605170a778610438bfabad7aa7764d0a77ef520ae392e2b59074c9f88cf 490910c1d4e1486d8e3a62d7c0ae698e - d67a18e70dd9467db25b74d33feaad6d default] Converted 10240.00 MB image at 32.22 MB/s I used the following command to create the qcow2 file qemu-img create -f qcow2 custom.qcow2 10G What am I missing ? Thanks Paras.
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