I have tryed to make a mkfs.ext3 on /dev/sda1, wich is the only partition crreated on a scsi disk, backed by a plain file.
I am using 0.7.5 with the debian lenny root filesystem image. The scsi parameter I am adding to the conf file is just
scsi0=disk,j:\test.bin (test.bin is a 8 GB empty file)
What happens is that mkfs starts quickly, but soon slows down, and can even freeze colinux. Sometimes it crashes windows also.
This also happened on the latest devel snapshot, and also when the scsi backing is a raw device.
Tested con Windows XP SP2