On Thu, 14 Jul 2016 at 17:17 Trent W. Buck via luv-main <luv-main@luv.asn.au> wrote:
Toby Corkindale via luv-main <luv-main@luv.asn.au> 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