Re: [Qemu-devel] qcow2 - safe on kill? safe on power fail?

[Jamie Lokier]

> It's a simple matter of allocating, making sure the allocation is on 
> disk, and recording that allocation in the tables.

The simple implementations are only safe if sector writes are atomic.

Opinions from Google seem divided about when you can assume that,
especially when the underlying file or device is not directly mapped
to disk sectors.

-- Jamie