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Re: ploop and trim/ discard support [message #47822 is a reply to message #47820] Wed, 12 September 2012 21:38 Go to previous messageGo to previous message
Corin Langosch is currently offline  Corin Langosch
Messages: 18
Registered: March 2012
Junior Member
On 12.09.2012 at 21:34 +0200, Kir Kolyshkin <kir@openvz.org> wrote:
>
> On Sep 12, 2012 11:20 PM, "Corin Langosch" <info@corinlangosch.com
> <mailto:info@corinlangosch.com>> wrote:
> >
> > Hi,
> >
> > it seems that when creating & deleting files inside a ploop backed
> container the backing image file doesn't shrink. So the image file is
> still consuming around 400 GB, while in the container df shows only
> 100 GB in use.
> >
> > ll on host: -rw------- 1 root root 384G Sep 12 21:06 root.hdd
> > df on container: /dev/ploop1 493G 103G 390G 21% /
>
> We have online shrink. It's "ploop balloon discard" or just "vzctl
> compact". You'd better have ploop and vzctl from git (both are really
> close to be released).
>

The system's still working heavily but the image is already reduced by
around 60 GB so it seems to work well. :)

Would you suggest putting some script into crontab to compact all ploop
images ex. once a week? Or probably do something like ctid%7 and compact
a few of them every night?

BTW: the man of vzctl contains the "compact" command. But the usage
output of vzctl doesn't. Shall I file a bug report for it?

BTW 2: I just read about the ploop ballooning technique in the wiki. Am
I correct in that it works quite similar to sdelete on windows (
http://pastie.org/4710364 or
http://technet.microsoft.com/en-us/sysinternals/bb897443.asp x)?

Thanks!

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