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Prl-disk-tool for Virtuozzo 7

201 bytes added, 13:10, 5 November 2015
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'''=== 1. Feature'''===
prl_disk_tool for Virtuozzo 7
'''=== 2. Description'''===
The package prl-disk-tool (binary /usr/sbin/prl_disk_tool)
can perform the following operations:
1. # ''resize --size ...'' : Resize image (in-place) 2. # ''resize --size ... --resize_partition'' : Resize image and last partition to fit (copying) 3. # ''resize --info'' : Display resize estimates (current size, minimum size, minimum size w/o resizing last partition) - '''VM only''' 4. # ''compact'' : Compact image to occupy less space on host disk. (in-place) 5. # ''compact --info'' : Display compact estimates (block count, allocated, used) - '''VM only''' 6. # ''merge'' : Merge internal snapshots of image (in-place) - '''VM only''' 7. # ''merge --external'' : Merge external snapshot of image (in-place) - '''VM only''' 8. # ''convert [--plain | --expanding]'' : Convert image between plain and expanding modes (copying) - '''VM only''' prl_disk_tool uses libguestfs, qemu-img to work. 
prl_disk_tool 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:
* ''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
The main purpose of prl_disk_tool is to automate some frequent operations.
'''=== 3. Products'''===
Virtuozzo 7 beta2
* qemu-img >= 1.5.3-86
'''=== 4. Testing'''===
Need to test the following cases:
* FS-aware functions (''resize --resize_partition|--info, compact [--info]'') work for ext2/ext3/ext4/ntfs/btrfs/xfs.
'''=== 5. Known issues'''===
* ''resize --resize_partition'' should be implemented in-place (due tolimitations of qcow2, only for expanding)
* ''convert --plain'' fallocate()s space inaccurately (due to unawareness of qcow2 internal structures).
* ''resize [expand]'' after ''convert --plain'' 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 ''convert'' operation)
 
 
== Links ==
 
* [https://lists.openvz.org/pipermail/users/2015-November/006598.html TRD in devel@ mail archive]
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