libguestfs/libguestfs-docs-master — Japanese @ Fedora Weblate: virt-sparsify seems to make the image grow to the full …

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	By far the most important thing you can do is to install and properly configure Squid. Note that the default configuration that ships with Squid is rubbish, so configuring it is not optional.
	A very good place to start with Squid configuration is here: L<https://fedoraproject.org/wiki/Extras/MockTricks#Using_Squid_to_Speed_Up_Mock_package_downloads>
	Make sure Squid is running, and that the environment variables C<$http_proxy> and C<$ftp_proxy> are pointing to it.
	With Squid running and correctly configured, appliance builds should be reduced to a few minutes.
	How can I speed up libguestfs builds (Debian)?
	Hilko Bengen suggests using "approx" which is a Debian archive proxy (L<http://packages.debian.org/approx>). This tool is documented on Debian in the approx(8) manual page.
	SPEED, DISK SPACE USED BY LIBGUESTFS
	B<Note:> Most of the information in this section has moved: L<guestfs-performance(1)>.
	Upload or write seem very slow.
	If the underlying disk is not fully allocated (eg. sparse raw or qcow2) then writes can be slow because the host operating system has to do costly disk allocations while you are writing. The solution is to use a fully allocated format instead, ie. non-sparse raw, or qcow2 with the C<preallocation=metadata> option.
	Libguestfs uses too much disk space!
	libguestfs caches a large-ish appliance in:
	/var/tmp/.guestfs-<UID>	/var/tmp/.guestfs-<UID>
	If the environment variable C<TMPDIR> is defined, then F<$TMPDIR/.guestfs-E<lt>UIDE<gt>> is used instead.
	It is safe to delete this directory when you are not using libguestfs.	libguestfs を使用していないとき、このディレクトリーを安全に削除できます。
	virt-sparsify seems to make the image grow to the full size of the virtual disk	virt-sparsify は仮想ディスクの全容量までイメージを拡大します。
	If the input to L<virt-sparsify(1)> is raw, then the output will be raw sparse. Make sure you are measuring the output with a tool which understands sparseness such as C<du -sh>. It can make a huge difference:
	$ ls -lh test1.img -rw-rw-r--. 1 rjones rjones 100M Aug 8 08:08 test1.img $ du -sh test1.img 3.6M test1.img	$ ls -lh test1.img -rw-rw-r--. 1 rjones rjones 100M Aug 8 08:08 test1.img $ du -sh test1.img 3.6M test1.img
	(Compare the apparent size B<100M> vs the actual size B<3.6M>)	(見た目の容量 B<100M> と実際の容量 B<3.6M> を比較します)
	If all this confuses you, use a non-sparse output format by specifying the I<--convert> option, eg:
	virt-sparsify --convert qcow2 disk.raw disk.qcow2
	Why doesn't virt-resize work on the disk image in-place?
	Resizing a disk image is very tricky -- especially making sure that you don't lose data or break the bootloader. The current method effectively creates a new disk image and copies the data plus bootloader from the old one. If something goes wrong, you can always go back to the original.
	If we were to make virt-resize work in-place then there would have to be limitations: for example, you wouldn't be allowed to move existing partitions (because moving data across the same disk is most likely to corrupt data in the event of a power failure or crash), and LVM would be very difficult to support (because of the almost arbitrary mapping between LV content and underlying disk blocks).
	Another method we have considered is to place a snapshot over the original disk image, so that the original data is untouched and only differences are recorded in the snapshot. You can do this today using C<qemu-img create> + C<virt-resize>, but qemu currently isn't smart enough to recognize when the same block is written back to the snapshot as already exists in the backing disk, so you will find that this doesn't save you any space or time.
	In summary, this is a hard problem, and what we have now mostly works so we are reluctant to change it.
	Why doesn't virt-sparsify work on the disk image in-place?
	In libguestfs E<ge> 1.26, virt-sparsify can now work on disk images in place. Use:
	virt-sparsify --in-place disk.img
	But first you should read L<virt-sparsify(1)/IN-PLACE SPARSIFICATION>.
	PROBLEMS OPENING DISK IMAGES

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type: =head2

Source string location

../docs/guestfs-faq.pod:613

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4 years ago

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a year ago

Source string age

4 years ago

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po-docs/ja.po, string 2063

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