[vbox-dev] writing to VHD/VDI is 50% slower of VMDK?
Frank.Mehnert at Sun.COM
Mon Oct 19 03:15:37 PDT 2009
On Tuesday 13 October 2009, Huihong Luo wrote:
> This seems to be always the case, writing a large amount of data to vdi/vhd
> is much much slower than writing to a vmdk disk.
> I am using the the vboxddu.dll code, and clone physical disk to virtual
> for example, clone 250G takes about 2.50 hrs to a vmdk file, whereas it
> takes 4 hrs to a vdi file, under exact conditions, quite reproducible.
> There is only writes to disks, no reads.
So this is a Windows host, correct? I can't imagine the reason for
such a slowdown as there are not many differences between the backends.
One differnece between .vmdk and .vdi is the block size. This needs
Dr.-Ing. Frank Mehnert Sun Microsystems, Inc. www.sun.com
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