Red Hat Bugzilla – Bug 904920
base images on local disk should be converted to raw *sparse*, not raw
Last modified: 2016-04-26 13:14:53 EDT
Description of problem:
There's very little benefit in converting images to raw and not to raw-sparse when bringing them to the compute's node /var/lib/nova/_base .
The default is to convert them to raw, but converting them to raw sparse could potentially be faster but certainly save a lot of IO and possibly space.
I doubt there's a performance difference.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
I'll second this idea. When I bring an image over for the first time onto a specific Nova Compute node, it absolutely KILLS that node I/O wise between doing the http get followed by the conversion of the qcow2 image to raw nonsparse.
If this is a reasonably small change I'd like to consider it for 2.1
After some discussions via email, we seem to have concluded that raw sparse is already being used here. Please reopen if that is not the case. Thanks.