Date: Mon, 26 Oct 2009 12:59:23 +0100 From: Hans Petter Selasky <hselasky@c2i.net> To: freebsd-hackers@freebsd.org Cc: hackers@freebsd.org, freebsd-usb@freebsd.org Subject: Re: Help troubleshooting... Message-ID: <200910261259.23500.hselasky@c2i.net> In-Reply-To: <20091026.054816.1631944692.imp@bsdimp.com> References: <20091025.133437.-1844000782.imp@bsdimp.com> <200910260959.20772.hselasky@c2i.net> <20091026.054816.1631944692.imp@bsdimp.com>
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On Monday 26 October 2009 12:48:16 M. Warner Losh wrote: > In message: <200910260959.20772.hselasky@c2i.net> > > Hans Petter Selasky <hselasky@c2i.net> writes: > : On Monday 26 October 2009 01:05:03 non@ever.sanda.gr.jp wrote: > : > M. Warner Losh wrote: > : > > I have a usb stick (8GB) on it. This stick has about 5GB of junk on > : > > it at this point. > : > > > : > > I tried to do 'cat * > /dev/null' recently, to measure how fast it > : > > goes. It got about 1GB into the drive and then I got device missing > : > > messages. > : > > > : > > So devfs thinks the device went missing: > : > > : > Warner-san, maybe it is caused by the hardware problem on the USB flash > : > memory. Some chip on the memory might have too much heat when you > : > access the memory at fast rate. Then it stops working. > : > : What happens if you read from two USB disks at the same time? > > I know that the august 25th version failed badly when I tried to burn > DVDs from a USB drive to a USB attached DVD burner. This used to work > flawlessly. > > : If the device went missing the USB HUB signalled that. This is maybe an > : indication that the USB firmware on the device crashed. Maybe this is due > : to heat, or unhandled race conditions when the load goes high. > > This same flash drive will do 20MB sustained on windows without a > glitch using similar commands. > > : Try using "dd" and vary the block size from 512 to 65536 bytes. Does it > : stop working with all block sizes over time? > > Once I get the message I posted, it is lights out for da0. No further > access to the drive works at all. > Make sure your driver has got sufficiently enough power, if powered over USB. --HPS
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