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FAQ: Document virt-sparsify >= 1.26 can do in-place sparsification.

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Richard W.M. Jones
2014-03-12 21:39:18 +00:00
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examples/guestfs-faq.pod
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@@ -692,22 +692,12 @@ so we are reluctant to change it.
=head2 Why doesn't virt-sparsify work on the disk image in-place?
Eventually we plan to make virt-sparsify work on disk images in-place,
instead of copying the disk image. However it requires several
changes to both the Linux kernel and qemu which are slowly making
their way upstream (thanks to the tireless efforts of Paolo Bonzini).
Then we will have to modify virt-sparsify to support this. Finally
there will be some integration work required to make sure all the
pieces work together.
In libguestfs E<ge> 1.26, virt-sparsify can now work on disk images in
place. Use:
Even with this implemented there may be some limitations: For example,
it requires completely different steps (and is probably harder) to
sparsify a disk image that is stored on a SAN LUN, compared to one
which is stored in a local raw image file, so you can expect that
different storage and backing formats will become supported at
different times. Some backing filesystems / formats may never support
sparsification (eg. disk images stored on VFAT, old-style non-thin
LVs).
virt-sparsify --in-place disk.img
But first you should read L<virt-sparsify(1)/IN-PLACE SPARSIFICATION>.
=head1 PROBLEMS OPENING DISK IMAGES