I notice on my system that bcache presents 4K sectors to Linux. This is causing me problems with Windows on Xen using my PV drivers (problem = doesn't work). I haven't figured out if it's my PV drivers that don't tell Windows the right thing, or if Windows just doesn't like 4K sectors.

Is the 4K sector thing intentional? I assume there is a performance improvement in doing so.

And what would be the performance impact if I just told Windows that it was dealing with 512 byte sectors (eg fake it)?

Thanks

James