Bug 904920 - base images on local disk should be converted to raw *sparse*, not raw
base images on local disk should be converted to raw *sparse*, not raw
Product: Red Hat OpenStack
Classification: Red Hat
Component: openstack-nova (Show other bugs)
Unspecified Unspecified
medium Severity low
: snapshot4
: 2.1
Assigned To: Russell Bryant
Yaniv Kaul
: Improvement, Triaged
Depends On:
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Reported: 2013-01-28 02:51 EST by Yaniv Kaul
Modified: 2016-04-26 13:14 EDT (History)
4 users (show)

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Doc Type: Enhancement
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Last Closed: 2013-02-18 15:25:06 EST
Type: Bug
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Description Yaniv Kaul 2013-01-28 02:51:44 EST
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.

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Comment 2 Perry Myers 2013-01-28 22:13:58 EST
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
Comment 3 Russell Bryant 2013-02-18 15:25:06 EST
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.

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