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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

...ps, 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 > > > [...

Hi, I''ve been working on getting a working blktap driver allowing to access ceph RBD block devices without relying on the RBD kernel driver and it finally got to a point where, it works and is testable. Some of the advantages are: - Easier to update to newer RBD version - Allows functionality only available in the userspace RBD library (write cache, layering, ...) - Less issue when

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