Difference between revisions of "Prl-disk-tool for Virtuozzo 7"
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can perform the following operations: | can perform the following operations: | ||
| − | # | + | # <code>resize --size ...</code> : Resize image (in-place) |
| − | # | + | # <code>resize --size ... --resize_partition</code> : Resize image and last partition to fit (copying) |
| − | # | + | # <code>resize --info</code> : Display resize estimates (current size, minimum size, minimum size w/o resizing last partition) - '''VM only''' |
| − | # | + | # <code>compact</code> : Compact image to occupy less space on host disk. (in-place) |
| − | # | + | # <code>compact --info</code> : Display compact estimates (block count, allocated, used) - '''VM only''' |
| − | # | + | # <code>merge</code> : Merge internal snapshots of image (in-place) - '''VM only''' |
| − | # | + | # <code>merge --external</code> : Merge external snapshot of image (in-place) - '''VM only''' |
| − | # | + | # <code>convert [--plain | --expanding]</code> : Convert image between plain and expanding modes (copying) - '''VM only''' |
| − | prl_disk_tool uses [http://libguestfs.org/ libguestfs], [http://wiki.qemu.org/download/qemu-doc.html#qemu_005fimg_005finvocation qemu-img] to work. | + | <code>prl_disk_tool</code> uses [http://libguestfs.org/ libguestfs], [http://wiki.qemu.org/download/qemu-doc.html#qemu_005fimg_005finvocation qemu-img] to work. |
The user has to install additional packages to use part of functionality: | The user has to install additional packages to use part of functionality: | ||
| − | * | + | * <code>prl-disk-tool resize --info</code> (last partition: btrfs) → btrfs-progs >= 4.2 (already in repo) |
| − | * | + | * <code>prl-disk-tool resize {--info,--resize_partition}</code> (last partition: ntfs) → libguestfs-winsupport (already in repo) |
| − | * | + | * <code>prl-disk-tool compact {--info,}</code> (exists partition with ntfs) → libguestfs-winsupport |
prl_disk_tool locks an image passed as argument by flock(). So only multiple | prl_disk_tool locks an image passed as argument by flock(). So only multiple | ||
| − | reads ( | + | reads (<code>{compact,resize} --info</code>) OR a single write (others) are allowed. |
| − | FS-aware functions ( | + | FS-aware functions (<code>resize {--resize_partition|--info}, compact [--info]</code>) work for ext2/ext3/ext4/ntfs/btrfs/xfs. |
| − | for ext2/ext3/ext4/ntfs/btrfs/xfs. | ||
| − | prl_disk_tool uses qemu-img to perform fs-unaware operations. It is more | + | <code>prl_disk_tool</code> uses <code>qemu-img</code> to perform fs-unaware operations. It is more powerful than qemu-img due to fs-aware operations performed with libguestfs. |
| − | powerful than qemu-img due to fs-aware operations performed with libguestfs. | ||
| − | The main purpose of prl_disk_tool is to automate some frequent operations. | + | The main purpose of <code>prl_disk_tool</code> is to automate some frequent operations. |
=== 3. Products === | === 3. Products === | ||
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* qemu-img >= 1.5.3-86 | * qemu-img >= 1.5.3-86 | ||
| − | === | + | === Testing === |
Need to test the following cases: | Need to test the following cases: | ||
| Line 56: | Line 54: | ||
* All functions work for qcow2 images. | * All functions work for qcow2 images. | ||
* Functions not tagged as '''VM only''' work for ploop images. | * Functions not tagged as '''VM only''' work for ploop images. | ||
| − | * FS-aware functions ( | + | * FS-aware functions (<code>resize --resize_partition|--info, compact [--info]</code>) work for ext2/ext3/ext4/ntfs/btrfs/xfs. |
| − | === | + | === Known issues === |
| − | * | + | * <code>resize --resize_partition</code> should be implemented in-place (due tolimitations of qcow2, only for expanding) |
| − | * all modifying operations have | + | * all modifying operations have <code>--dry-run</code> option to not modify an image. The image is still opened for write, and exclusive lock is acquired. |
* only listed filesystems are supported | * only listed filesystems are supported | ||
| − | * virt-resize, used by | + | * virt-resize, used by <code>resize --resize_partition</code>, leaves an empty block of ~3M at the end of image. |
| − | * | + | * <code>convert --plain</code> fallocate()s space inaccurately (due to unawareness of qcow2 internal structures). |
| − | * | + | * <code>resize [expand]</code> after <code>convert --plain</code> does not force allocation of new (bigger) chunk of space (we do not keep image type (plain/expanding) for now - so it is impossible to determine whether we should allocate space outside of <code>convert</code> operation) |
Latest revision as of 13:40, 21 December 2015
1. Feature[edit]
prl_disk_tool for Virtuozzo 7
2. Description[edit]
The package prl-disk-tool (binary /usr/sbin/prl_disk_tool) is used to manage virtual machine and container disk images can perform the following operations:
resize --size ...: Resize image (in-place)resize --size ... --resize_partition: Resize image and last partition to fit (copying)resize --info: Display resize estimates (current size, minimum size, minimum size w/o resizing last partition) - VM onlycompact: Compact image to occupy less space on host disk. (in-place)compact --info: Display compact estimates (block count, allocated, used) - VM onlymerge: Merge internal snapshots of image (in-place) - VM onlymerge --external: Merge external snapshot of image (in-place) - VM onlyconvert [--plain | --expanding]: Convert image between plain and expanding modes (copying) - VM only
prl_disk_tool uses libguestfs, qemu-img to work.
The user has to install additional packages to use part of functionality:
prl-disk-tool resize --info(last partition: btrfs) → btrfs-progs >= 4.2 (already in repo)prl-disk-tool resize {--info,--resize_partition}(last partition: ntfs) → libguestfs-winsupport (already in repo)prl-disk-tool compact {--info,}(exists partition with ntfs) → libguestfs-winsupport
prl_disk_tool locks an image passed as argument by flock(). So only multiple
reads ({compact,resize} --info) OR a single write (others) are allowed.
FS-aware functions (resize {--resize_partition|--info}, compact [--info]) work for ext2/ext3/ext4/ntfs/btrfs/xfs.
prl_disk_tool uses qemu-img to perform fs-unaware operations. It is more powerful than qemu-img due to fs-aware operations performed with libguestfs.
The main purpose of prl_disk_tool is to automate some frequent operations.
3. Products[edit]
Virtuozzo 7 beta2
Packages:
- prl-disk-tool >= 7.0.5
- libguestfs >= 1.28.1-1.18
- btrfs-progs >= 4.2 (optional)
- libguestfs-winsupport >= 7.2.1 (optional)
- libguestfs-xfs (in dependencies)
- qemu-img >= 1.5.3-86
Testing[edit]
Need to test the following cases:
- All functions work for qcow2 images.
- Functions not tagged as VM only work for ploop images.
- FS-aware functions (
resize --resize_partition|--info, compact [--info]) work for ext2/ext3/ext4/ntfs/btrfs/xfs.
Known issues[edit]
resize --resize_partitionshould be implemented in-place (due tolimitations of qcow2, only for expanding)- all modifying operations have
--dry-runoption to not modify an image. The image is still opened for write, and exclusive lock is acquired. - only listed filesystems are supported
- virt-resize, used by
resize --resize_partition, leaves an empty block of ~3M at the end of image. convert --plainfallocate()s space inaccurately (due to unawareness of qcow2 internal structures).resize [expand]afterconvert --plaindoes not force allocation of new (bigger) chunk of space (we do not keep image type (plain/expanding) for now - so it is impossible to determine whether we should allocate space outside ofconvertoperation)
