Hello, Am Dienstag 02 November 2010 23:45:59 schrieb Eric Blake: > On 10/25/2010 08:06 AM, Richard W.M. Jones wrote: > >> libvirt's qemu driver doesn't currently preallocate qcow2 metadata > >> when creating a new image. Given the tiny disk space overhead of the > >> metadata (0.02%) and the small processing overhead of pre-creation > >> relative to subsequent creation on-the-fly, I suggest that the > >> libvirt qemu driver is updated to pre-allocate metadata by default. ... > Is this something that we should just globally enable if qemu supports > it, or do we need some XML tunable to allow someone to skip the > pre-allocation for some reason? I don't know if its relevant, but if you create a qcow2 image, which is based on another base-image, you must not pass the option to pre-allocate, else you get the following error message: Backing file and preallocation cannot be used at the same time Sincerely Philipp Hahn -- Philipp Hahn Open Source Software Engineer hahn univention de Univention GmbH Linux for Your Business fon: +49 421 22 232- 0 Mary-Somerville-Str.1 28359 Bremen fax: +49 421 22 232-99 http://www.univention.de
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