Re: [Libguestfs] [libvirt-users] Suggestions on building VM disks from scratch

On Wed, Apr 04, 2012 at 09:45:18AM +0100, Richard W.M. Jones wrote: This leaves the swap partition unaligned :-( If you care about alignment (and you probably should) then this will create properly aligned partitions: part-add /dev/sda p 128 $(( 9*1024*1024*2 - 1 )) part-add /dev/sda p $(( 9*1024*1024*2 )) -128 'Course the 'virt-alignment-scan' tool can be used to detect if your partitions are aligned correctly. With the original image: $ virt-alignment-scan -a test.img /dev/sda1 32768 32K bad (alignment < 64K) /dev/sda2 9663676928 512 bad (alignment < 4K) With the correctly aligned image: $ virt-alignment-scan -a test.img /dev/sda1 65536 64K ok /dev/sda2 9663676416 1048576K ok Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones libguestfs lets you edit virtual machines. Supports shell scripting, bindings from many languages. http://libguestfs.org