>>>> I have some problems with Jmicron JMS567 (Sata 6 Gb/s -> USB3.0) >>> mobile rack. >>>> >>>> I tried on different kernels: >>>> 3.15.5 >>>> 3.16.rc6 >>>> >>>> I got the following errors when I ran a mkfs.ext4 command and then >>> the >>>> device disappeared. >>>> >>>> Jul 26 19:54:37 debian kernel: [ 118.060026] usb 8-3: new >>> high-speed >>>> USB device number 2 using ehci-pci >>> >>> Hans, shouldn't we default to usb-storage rather than uas if the >>> device >>> supports both and isn't connected at SuperSpeed? >> >> We would give up command tagging needlessly. > > Right, that is what I was about to say. For testing purposes > I've a Fedora rawhide install a ssd in a usb3 uas 2.5" enclosure, > and it is much faster with uas in usb2 ports too. > > It looks like the device disconnects as soon as we start using > multiple requests at once (it seems to disconnect immediately > after the basic probing). > > This could be a power issue. Laszlo, what sort of drive is in the > mobile rack, and how is it powered ? > I don't think it is a power issue. I'm using on desktop PC on usb2 port with just a simple cable but the disk (WD5000LPVX) only consumes 1.4 Watts (read/write) and it is stable on Windows. And I found an interesting thing: it is also stable with NTFS file system under Linux even on 3.14 kernel (that does not contain the 'usb-storage/SCSI: Add broken_fua blacklist flag' patch https://www.mail-archive.com/linux-scsi@xxxxxxxxxxxxxxx/msg30073.html ). Br, Laszlo -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
