On 08/25/2010 08:07 AM, Avi Kivity wrote:
The next allocation can then be filled from memory, so the
allocation sync is amortized over many blocks. A power fail will
leak the preallocated blocks, losing some megabytes of address
space, but not real disk space.
It's a clever idea, but it would lose real disk space which is
probably not a huge issue.
Not real disk space since no pwrite() would ever touch the disk. If
the image were copied, _then_ we'd lose the disk space, if the copy
command and filesystem don't optimize zeros away. \
Ok.
Regards,
Anthony Liguori
And that's it. There is no scenario where the disk is corrupted.
_if_ that's the only failure mode.
If we had another disk format that only supported growth and metadata
for a backing file, can you think of another failure scenario?
I can't think of one, but that's not saying much.
