On Tue, 19 Mar 2024 15:08:57 +0100 Michael Reinelt <michael@xxxxxxxxxxxxx> wrote: > I think I found at least a workaround: the strange behaviour disappears immediately, if I disable > UAS, and use usb-storage for the externel USB drive. > > options usb-storage quirks=04e8:4001:u > > I am sure that UAS has been used with kernel 6.1, too, where it did not cause any issues... > > Ideas what is going wrong in kernel 6.6? I'd like to re-enable UAS, because UAS is about 200 MB/sec > faster than usb-storage I think it might be related to discard or write zeroes support on 6.6. I had some issues enabling USB TRIM on kernel 6.6, compared to 6.1. What do you get for "lsblk -D" on both kernels and both storage drivers on 6.6, are there any differences? Aside from that, trying "blktrace" was a good suggestion to figure out the process writing or even the content of what is being written. -- With respect, Roman
