[Users] vzctl compact fails to compact container, what can i do

[Rene C.]

Good answer, thanks much!!


On Mon, Dec 23, 2013 at 4:47 PM, Andrew Vagin <avagin at parallels.com> wrote:
> On Mon, Dec 23, 2013 at 04:28:14PM +0700, Rene C. wrote:
>> Indeed, that seems to have been at least part of the problem, thanks much.
>>
>> Still, after having removed all snapshots and rerun vzctl compress, I
>> still ended up with a pigz compressed backup of 40G for a container
>> with 2G used disk space (shown by df -h within the container).  Any
>> idea how that can happen?
>
> Yes, I have. The size of ploop clusters is 1MB. It's much bigger than
> a file system block size (4KB). The file system can allocate 1 block
> (4K), but one cluster (1Mb) on ploop will be allocated.
>
> If a file system spreads blocks far from each other, it can freeze much
> more space in ploop image.
>
> We know this problem and going to fix it in a near future.
>
>>
>> On Sat, Dec 21, 2013 at 11:13 PM, Andrew Vagin <avagin at parallels.com> wrote:
>> > On Sat, Dec 21, 2013 at 09:08:43PM +0700, Rene C. wrote:
>> >> We have a container that needs moving to another hardware node, but a
>> >> vzpbackup of it is 250G.
>> >>
>> >> Within the container only 1.9G is used:
>> >>
>> >> /dev/ploop33244p1  393G  1.9G  371G   1% /
>> >>
>> >> Tried running a vzctl compact but it just shows a few lines and stops
>> >> without having done anything:
>> >>
>> >> # vzctl compact 1709
>> >> Trying to find free extents bigger than 0 bytes
>> >> Waiting
>> >> Call FITRIM, for minlen=33554432
>> >> Call FITRIM, for minlen=16777216
>> >> Call FITRIM, for minlen=8388608
>> >> Call FITRIM, for minlen=4194304
>> >> Call FITRIM, for minlen=2097152
>> >> Call FITRIM, for minlen=1048576
>> >> 0 clusters have been relocated
>> >>
>> >> /vza1/private/1709/root.hdd has following files:
>> >>
>> >> -rw-r--r-- 1 root root            1478 Dec 21 20:35 DiskDescriptor.xml
>> >> -rw------- 1 root root               0 Nov 27 12:33 DiskDescriptor.xml.lck
>> >> -rw------- 1 root root 257 447 428 096 Dec 20 07:42 root.hdd
>> >> -rw------- 1 root root     376 438 784 Dec 20 09:27 root.hdd.{e66fccca-85cf-4bf2-888d-6669988f1da6}
>> >> -rw------- 1 root root     517 996 544 Dec 21 17:49 root.hdd.{f881c603-48cd-4e21-af63-45e49ce715ba}
>> >> drwx------ 2 root root            4096 Nov 27 12:34 root.hdd.mnt
>> >>
>> >> What can we do to compress this down to the actual 2G used?
>> >
>> > Looks like you did a snapshot, didn't you? In this case only the last
>> > delta is compacted.
>> >
>> > You can try to delete snapshots and compress the disk again.
>> >
>> >>
>> >> 2.6.32-042stab081.5
>> >> e2fsprogs-resize2fs-static-1.42.3-3.el6.1.ovz.x86_64
>> >> vzctl-4.5.1-1.x86_64
>> >> vzkernel-2.6.32-042stab081.5.x86_64
>> >> vzctl-core-4.5.1-1.x86_64
>> >> vzquota-3.1-1.x86_64
>> >> vzstats-0.5.2-1.noarch
>> >> ploop-lib-1.9-1.x86_64
>> >> ploop-1.9-1.x86_64
>> >> _______________________________________________
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>> >> Users at openvz.org
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