Re: [Qemu-devel] Block job commands in QEMU 1.2 [v2, including support for replication]

[Paolo Bonzini]

Il 31/05/2012 13:08, Geert Jansen ha scritto:
> 1) Target flushes are not guaranteed to happen at all. If the latency of
> the target is higher than the maximum interval between writes to the
> source, the bitmap will always be dirty when a write to the target
> returns, and a target flush will never be issued.

That's a very good point.

> 2) The fact that drive-mirror waits for acknowledgments of writes to the
> target means that there is at most one I/O outstanding and throughput is
> bound by latency.

That can be fixed, I'll add it on my ever-growing todo list. :)

Paolo