On Sun, Oct 09, 2011 at 03:26:52PM -0400, Alex wrote: > > >> <disk type='file' device='disk'> > >> <driver name='qemu' type='raw'/> > >> <source file='/var/lib/libvirt/images/mail02.img'/> > >> <target dev='vda' bus='virtio'/> > >> <address type='pci' domain='0x0000' bus='0x00' slot='0x05' > >> function='0x0'/> > > > > I meant raw disk devices rather than files e.g. > > <disk type='block' device='disk'> > > <driver name='qemu' type='raw' cache='none'/> > > <source dev='/dev/server02_vg1_2tb/lv_vm03_swap'/> > > <target dev='vdb' bus='virtio'/> > > </disk> > > > > This eliminates one layer of filesystem overheads. > > Can this type change be done without modifying the image, or must > some conversion be done prior to making this change? You can do that at any time; it just requires a reboot. You really want caching off; see http://publib.boulder.ibm.com/infocenter/lnxinfo/v3r0m0/index.jsp?topic=%2Fliaat%2Fliaattunkickoff.htm -Robin
