[libvirt-users] Create RBD Format 2 disk images with qemu-image
Hello, I would like to use RBD Format 2 images so I can take advantage of layering. However, when I use "qemu-img create -f rbd rbd:data/foo 10G", I get format 1 RBD images. (Actually, when I use the "-f rbd" flag, qemu-img core dumps, but it looks like that feature may have been deprecated [1]) Is there any way to have qemu-img create RBD Format 2 images or am I better off using `rbd` to create the image then booting from the disk and performing the install, etc.? Thanks for the assist. Best Regards, Jon A [1] http://lists.ceph.com/pipermail/ceph-users-ceph.com/2013-June/002131.html
On 10/17/2013 05:28 AM, Jon wrote:
Hello,
I would like to use RBD Format 2 images so I can take advantage of layering.
However, when I use "qemu-img create -f rbd rbd:data/foo 10G", I get format 1 RBD images. (Actually, when I use the "-f rbd" flag, qemu-img core dumps, but it looks like that feature may have been deprecated [1])
Is there any way to have qemu-img create RBD Format 2 images or am I better off using `rbd` to create the image then booting from the disk and performing the install, etc.?
If you're using recent cuttlefish or dumpling releases of ceph, you can add settings to ceph.conf to make qemu-img and anything else using librbd create format 2 images. In the [client] or [global] section of /etc/ceph/ceph.conf, add: rbd default format = 2 Josh
Thanks for the assist.
Best Regards, Jon A
[1] http://lists.ceph.com/pipermail/ceph-users-ceph.com/2013-June/002131.html
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Hi Josh, Thanks! That is way too easy. Best Regards, Jon A On Mon, Oct 21, 2013 at 10:34 AM, Josh Durgin <josh.durgin@inktank.com> wrote:
On 10/17/2013 05:28 AM, Jon wrote:
Hello,
I would like to use RBD Format 2 images so I can take advantage of layering.
However, when I use "qemu-img create -f rbd rbd:data/foo 10G", I get format 1 RBD images. (Actually, when I use the "-f rbd" flag, qemu-img core dumps, but it looks like that feature may have been deprecated [1])
Is there any way to have qemu-img create RBD Format 2 images or am I better off using `rbd` to create the image then booting from the disk and performing the install, etc.?
If you're using recent cuttlefish or dumpling releases of ceph, you can add settings to ceph.conf to make qemu-img and anything else using librbd create format 2 images. In the [client] or [global] section of /etc/ceph/ceph.conf, add:
rbd default format = 2
Josh
Thanks for the assist.
Best Regards, Jon A
[1] http://lists.ceph.com/pipermail/ceph-users-ceph.com/2013-June/002131.html
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