The limitation is due to what is supported by the qemu-img snapshot -c command
AFAIK this works with qcow only, but perhaps other formats are supported.
use_cow_image=true # always works
use_cow_image=false # only works if force_raw_images=false AND
original_image_format = qcow
Vish
On Apr 10
Vish:
For documentation purposes, if the user wants to be able to do snapshots, what
combinations of the following three variables are allowed?
1. original image format (qcow2 | raw)
2. use_cow_image flag (true | false)
3. force_raw_images flag (true | false)
Take care,
Lorin
--
Lorin Hochste
You can disable using backing files with the following config:
use_cow_images=false
You should be aware that you likely won't be able to snapshot images unless you
make sure to upload them all in qcow format and also set:
force_raw_images=false
On Apr 9, 2012, at 9:37 PM, William Herry wrote:
>
Hi
I read from an article that said use preallocation can improve disk I/O
performance in kvm, when I add it to openstack, suck error come to me
(nova.rpc.amqp): TRACE: Stderr: 'Backing file and preallocation cannot be
used at the same time\nqemu-img:
/usr/local/lib/python2.7/dist-packages/nova-2
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