On Tue, Nov 18, 2025 at 01:40:28PM +0100, Uladzislau Rezki wrote: > > If logical < physical, then the device performs read-modify-write cycle > > when writing blocks that are not aligned at physical block size. > > > This is not true. It depends on your device and specification. If it > can't there is the dm-ebs that does the job.
Logical blocks size is the access unit. Physical block size is a hint that the device might be doing RWF and thus be slow. What driver/device are using? Whatever it is doing is completely broken. (that being said aligning things to the physical block size as much as possible is usually still a good optimization, that's why the value exists).
