[Qemu-devel] TRIM, UNMAP and QCOW2 release of block information - Thin provisioning

[Gerhard Wiesinger]

Hello,

As far as I saw QEMU/KVM supports the trim command on IDE/SATA devices 
and the UNMAP command on SCSI devices/disks (thanks Paolo Bonzini). Will 
the qcow2 format (or other formats) use this information and also 
release the blocks for thin provisioning to save disk space on filesystems?

VirtualBox also has such a feature in the new beta version:
http://www.fb-developers.info/blog/2012/virtualbox-v4-2-is-coming/

Thnx.

Ciao,
Gerhard

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