On Wed, Sep 22, 2010 at 03:17:03PM +0200, Jim Meyering wrote: > Richard W.M. Jones wrote: > > On Wed, Sep 15, 2010 at 05:47:23PM +0200, Jim Meyering wrote: > >> Richard W.M. Jones wrote: > >> > If you take a virtual disk and truncate it, then likely some > >> > partitions in the partition table will be off the end of the disk. > >> > > >> > However parted refuses to start up in this case. It says: > >> > > >> > Error: Can't have a partition outside the disk! > >> > > >> > even if you are trying to do something sensible such as deleting a > >> > partition which is outside the disk. > >> > > >> > I can't really see a "good" way to solve this, since it happens in the > >> > depths of the constraints/geometry code. The attached patch just > >> > deletes the error check, on the basis that parted should confine > >> > itself to partition tables and not worry about the size of the disk. > >> > Discuss ... > >> > >> Hi Rich, > >> > >> What is your use case? It seems rather unusual > >> to want to do something with existing partitions > >> once you have shrunk the underlying device. > >> IMHO, that is not enough of a reason to remove > >> the offending check altogether. > > > > We want to shrink the disk, then recreate the partition table, but at > > the same time preserve the boot sector and boot loader. To do this we > > copy the blocks at the start of the disk (up to just before the first > > partition), then attach to this disk and remove the existing > > partitions. The parted program fails at this point. > > Hi Rich, > > If you first remove all partitions (possibly exempting any > GRUB_BIOS partition), or at least the partitions that would be > impacted by the planned shrinkage, you will have no problem. > Can you do that? > > That worked for me in a contrived example.
I guess so, but unfortunately it doesn't work with the architecture of virt-resize. I will look into whether we can change how we do things ... It would be nice if parted 'just worked' more often though, instead of necessitating so many workarounds. Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones virt-top is 'top' for virtual machines. Tiny program with many powerful monitoring features, net stats, disk stats, logging, etc. http://et.redhat.com/~rjones/virt-top _______________________________________________ parted-devel mailing list [email protected] http://lists.alioth.debian.org/mailman/listinfo/parted-devel
