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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:pradhanparas at gmail.com] 
Sent: Monday, July 31, 2017 11:54 PM
To: openstack-operators at 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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