+# Not as sophisticated as the guestfish progress bar, because
+# I intend to use an external library for this at some point (XXX).
+sub progress_callback
+{
+ my $proc_nr = shift;
+ my $serial = shift;
+ my $position = shift;
+ my $total = shift;
+
+ my $ratio = $position / $total;
+ if ($ratio < 0) { $ratio = 0 }
+ elsif ($ratio > 1) { $ratio = 1 }
+
+ my $dots = int ($ratio * 76);
+
+ print "[", "#"x$dots, "-"x(76-$dots), "]\r";
+ print "\n" if $ratio == 1;
+}
+
+=head1 NOTES
+
+=head2 "Partition 1 does not end on cylinder boundary."
+
+Virt-resize aligns partitions to multiples of 64 sectors. Usually
+this means the partitions will not be aligned to the ancient CHS
+geometry. However CHS geometry is meaningless for disks manufactured
+since the early 1990s, and doubly so for virtual hard drives.
+Alignment of partitions to cylinders is not required by any modern
+operating system.
+
+=head2 RESIZING WINDOWS VIRTUAL MACHINES
+
+In Windows Vista and later versions, Microsoft switched to using a
+separate boot partition. In these VMs, typically C</dev/sda1> is the
+boot partition and C</dev/sda2> is the main (C:) drive. We have not
+had any luck resizing the boot partition. Doing so seems to break the
+guest completely. However expanding the second partition (ie. C:
+drive) should work.
+
+Windows may initiate a lengthy "chkdsk" on first boot after a resize,
+if NTFS partitions have been expanded. This is just a safety check
+and (unless it find errors) is nothing to worry about.
+
+=head2 GUEST BOOT STUCK AT "GRUB"
+
+If a Linux guest does not boot after resizing, and the boot is stuck
+after printing C<GRUB> on the console, try reinstalling grub. This
+sometimes happens on older (RHEL 5-era) guests, for reasons we don't
+fully understand, although we think is to do with partition alignment.
+
+ guestfish -i -a newdisk
+ ><fs> cat /boot/grub/device.map
+ # check the contents of this file are sensible or
+ # edit the file if necessary
+ ><fs> grub-install / /dev/vda
+ ><fs> exit
+
+For more flexible guest reconfiguration, including if you need to
+specify other parameters to grub-install, use L<virt-rescue(1)>.
+
+=head1 ALTERNATIVE TOOLS
+
+There are several proprietary tools for resizing partitions. We
+won't mention any here.
+
+L<parted(8)> and its graphical shell gparted can do some types of
+resizing operations on disk images. They can resize and move
+partitions, but I don't think they can do anything with the contents,
+and they certainly don't understand LVM.
+
+L<guestfish(1)> can do everything that virt-resize can do and a lot
+more, but at a much lower level. You will probably end up
+hand-calculating sector offsets, which is something that virt-resize
+was designed to avoid. If you want to see the guestfish-equivalent
+commands that virt-resize runs, use the C<--debug> flag.
+
+=head1 SHELL QUOTING
+
+Libvirt guest names can contain arbitrary characters, some of which
+have meaning to the shell such as C<#> and space. You may need to
+quote or escape these characters on the command line. See the shell
+manual page L<sh(1)> for details.
+
git.annexia.org / libguestfs.git / blobdiff