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Message #19370
[Bug 1005956] Re: First VM provisioning is slow for large VM images
Since this bug was filed a lot has been done to make this faster
** Changed in: nova
Status: Confirmed => Won't Fix
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https://bugs.launchpad.net/bugs/1005956
Title:
First VM provisioning is slow for large VM images
Status in OpenStack Compute (Nova):
Won't Fix
Bug description:
To provision a VM, OpenStack:
(1) copies the image over the network to the compute node in _base directory
(2) If its a qcow2 image, it is converted to raw
(3) Creates a copy of the raw using cp operation.
(4) Creates qcow2 disks from the image in (3).
(2) can eliminated using force_to_raw=False in nova.conf
However, copying is a costly operation, if the image size is large.
Image size can be large due to VM snapshotting, or for Windows images.
Need to eliminate it. Can we simply create qcow2 disks from the image
copied over the network? Something like:
qemu-img create -o qcow2 new.img 10G -b image_from_network
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