On Mon, Dec 09, 2013 at 09:03:23PM -0800, Jitesh Shah wrote: > > Now, if the script is ran in the SAME way for all 5 HDDs, is it > guaranteed that these HDDs will be same at the block level too? (i.e. > block allocation/deallocation will follow the same pattern). Assume > single-core system with only one process modifying the HDD in > predetermined order. Nope, there's no way to guarantee this. There are a few places where the algorithms are non-deterministic by design. It would be possible to make some changes to guarantee this, but I'm not sure it's really worth it --- in real life, assuming a single core system with a single process which is also single threaded is generally not a realisstic scenario. > Why do I ask -> I am tinkering with the idea of block level > verification of images. If the above guarantees can be provided, I can > easily hash the raw HDD for verification purposes. If you want to do a block level verification of the image, why not also do block level update of the image as well? Regards, - Ted -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
