From: Ralf Ramsauer <ralf@ramses-pyramidenbau.de>
To: qemu-devel@nongnu.org
Subject: [Qemu-devel] Using TRIM to shrink qcow2 images
Date: Thu, 08 Aug 2013 12:34:55 +0200 [thread overview]
Message-ID: <5203744F.4010407@ramses-pyramidenbau.de> (raw)
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?
[1] : https://people.gnome.org/~markmc/qcow-image-format.html
Regards,
--
Ralf Ramsauer
PGP: 0x8F10049B
next reply other threads:[~2013-08-08 10:35 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-08 10:34 Ralf Ramsauer [this message]
2013-08-08 11:47 ` [Qemu-devel] Using TRIM to shrink qcow2 images François Revol
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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