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Re: Bizarre issue: USB 3 disconnecting and dying


Hey David, did you ever get this figured out?

Did you ever inspect the device parameters via sdparm or hdparm?
I have *heard* of some Seagate devices disappearing when they go into suspend, but your problem doesn't sound like this issue since it happens in the middle of writing. Still, I thought I'd mention it.
My experience with hdparm on USB devices isn't good, but it works for some people. hdparm -I that thing. 

For sdparm, do this:
    sudo sdparm --flexible -6 -l -a /dev/sdb
You might be able/need to remove "--flexible" and "-6". Those are compatibility options that some of my devices need. 

Good luck to you!



On 7/22/15 16:20, David Fuchs wrote:
On Wed, Jul 22, 2015 at 3:17 PM, Håkon Alstadheim <hakon@alstadheim.priv.no <mailto:hakon@alstadheim.priv.no>> wrote: 

    How long are your USB-cables? What kind of power supply do you
    have, and what else is drawing power?
The USB cable the drive is currently on is fairly short - about 80cm if I had to guess. The drive has its own wall-wart specced at 2A (12V). There's nothing plugged into the USB ports that would draw power (the only other device plugged in is a UPS). 


    I just went from a PSU specced at 5x the needed sustained power to
    10x . Got a slight but definite improvement in USB stability. Yes,
    my system is drawing ~ 150w from a 1200w supply. Externally
    powered hubs were no help. 5v is specced at 30amps max. I still
    get drop-outs , very rarely reqiuring hard boot now, except if I
    try the multi-media-keys on my back-lit usb2.0 keyboard.
The host is powered by a 300W Fortron SFX PSU, which should be about 5-6x of actual power draw. It's plugged into the UPS so power should be fairly stable... but you do bring up a good point, the PSU is one element I hadn't considered. Might try to swap that out, too, when I get a chance. 



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