On Thu, 14 Jul 2016 at 17:17 Trent W. Buck via luv-main <[email protected]> wrote:
> Toby Corkindale via luv-main > <[email protected]> writes: > > > Hi, > > 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? > No * does it draw too much power for that port? > No * 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 > testing. > 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 drive? > Negative. Neither does hdparm. Thanks for the suggestions though. -Toby
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