On Thu, 14 Jul 2016 at 17:17 Trent W. Buck via luv-main <luv-main(a)luv.asn.au
Toby Corkindale via luv-main
I've hit a strange issue with a new USB storage device.
(Corsair Slider X2 64GB)
(I'll test on an alternative Linux system tonight, with a slightly
different Linux kernel and motherboard.)
Brainstorm things to check:
* remove any unnecessary components e.g. USB hubs from the environment.
* does dmesg complain about it?
* does it draw too much power for that port?
* are other port blocks (different chipset &c) OK?
> e.g. front panel is often worse.
Seems to perform the same.
* Is it DEFINITELY doing more than USB2 theoretical max?
> Compare the speed you get to the max speed of USB2 and USB3.
> (IIRC USB2.0 is 480mbps = 60MiB/s).
I can read at nearly 100mbyte/sec, which is definitely USB3 speed.
> * is power saving being auto-enabled ever time you plug in the device,
> by some crack-smoking udev rule? Remember to check the device *and*
> the internal hub. If powertop --auto is involved, remove it while
powertop is not running. I'm not sure how to check the rest :/
Another fast USB stick is confirmed as working at ~60mbyte/sec in the same
machines and ports though.
* is the system doing a lot of fsyncs &c at the time?
> this can break even unrelated filesystems IME.
Err, to some degree, yes.. both systems I've tested have had apps running,
at least in the background. But this is true for a Windows system too --
there's always a whole lotta stuff going on in there.
> The place I hit it was doing a dpkg install (many many syncs) while
> under heavy RRD write load (random access).
> * faint hope, but does SMART work with the
Negative. Neither does hdparm.
Thanks for the suggestions though.