On Aug 1, 2016, at 5:43 PM, David Christensen <dpchr...@holgerdanske.com> wrote:
> On 08/01/2016 12:14 PM, Nicolas George wrote:
>> Try starting « dmesg -w » before plugging the drive, and observe the error
>> messages that the kernel will start throwing out.
>
> 2016-08-01 17:36:18 dpchrist@i72600s ~
> $ dmesg -w
> dmesg: invalid option -- 'w'
>
>
> David
What version of the util-linux package are you using?
Please see us the output of
aptitude versions util-linux
Jessie seems to have 2.25.2-6, while Stretch has 2.28-6. Maybe the “-w” (alias
“—follow”) option was added between the two?
But, when I try it on either Jessie or Stretch, I get the expected stream of
messages… Hmmm.
The man page says:
>
> -w, --follow
> Wait for new messages. This feature is supported only on
> systems with a readable /dev/kmsg (since kernel
> 3.5.0).
Which suggest that your kernel doesn’t have the feature, being prior to 3.5.0.
In any case, you might be able to get the same results by doing
dmesg > /tmp/part1
… do your experiments …
dmesg > /tmp/part2
diff /tmp/part1 /tmp/part2
Worth a try, anyway…
If it works, look for messages about I/O errors and see if the surrounding
messages give any clues to what is going on.
Do you get the same problem if you use a USB2 socket instead of the second
USB3? Maybe the mainboard can’t handle the data rate from two simultaneously
active USB3 ports?
Rick
