On 28/09/2015 05:29, Jeff Cody wrote: > This only occurs under two conditions: > > 1. 'mode' != "existing" > 2. bdrv_has_zero_init(target) == NULL >
I'm not sure if mode != "existing" actually matters. I think what actually matters is sync == "full". The reasons are: 1) with sync != "full", unallocated target sectors should remain unallocated on the destination because they are supposed to point to the backing file. 2) even with mode == "existing" you expect the data to be consistent at the end of the mirroring Paolo
