From: "François Revol" <revol@free.fr>
To: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] Using TRIM to shrink qcow2 images
Date: Thu, 08 Aug 2013 13:47:03 +0200 [thread overview]
Message-ID: <52038537.40008@free.fr> (raw)
In-Reply-To: <5203744F.4010407@ramses-pyramidenbau.de>
On 08/08/2013 12:34, Ralf Ramsauer wrote:
> Hi,
>
> QCOW2 uses a similar idea like file holes (sparse files) on filesystems [1].
> RAW Images also may use file holes.
>
> If qemu would support TRIM, then the guest could easily discard and zero
> all unused blocks.
> The host system could detect all unused blocks in a (e.g.) qcow2 image
> and shrink it down to its minimum size.
>
> Did anyone already think about that?
>
Yes but no time to implement.
I believe VirtualBox has some support for TRIM already btw.
François.
next prev parent reply other threads:[~2013-08-08 11:47 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-08 10:34 [Qemu-devel] Using TRIM to shrink qcow2 images Ralf Ramsauer
2013-08-08 11:47 ` François Revol [this message]
2013-08-08 12:00 ` Paolo Bonzini
2013-10-04 6:22 ` Alexey Kardashevskiy
2013-10-04 7:05 ` Paolo Bonzini
2013-10-04 7:07 ` Alexey Kardashevskiy
2013-10-04 12:45 ` Paolo Bonzini
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