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From: Hans Petter Selasky <hselasky@c2i.net>
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Date: Tue, 27 Dec 2011 10:36:24 +0100
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Cc: Momchil Ivanov <momchil@xaxo.eu>
Subject: Re: USB problems with 8.2
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On Monday 26 December 2011 23:26:41 Momchil Ivanov wrote:
> Hi,
> 
> I am currently experiencing some problems with USB. I have a SATA hdd
> connected to my computer with a USB adapter. When using rtorrent on a good
> connection with 2-3 MB/s after a minute or two all file system operations
> on the USB hdd get stalled from time to time for several seconds. Finally
> after 3-4 minutes all operations get stalled and when I unplug the drive
> most of the time my computer reboots. I am using FreeBSD 8.2-STABLE #0:
> Sat Oct 22 16:07:57 CEST 2011. I am not experiencing this problems when
> not having rtorrent on: watching a movie, compiling ports ... etc. The
> stall seems also to occur when rtorrent is checking the hashes. Btw I have
> tried the same with a USB flash drive and am experiencing the same kind of
> stall when doing rtorrent.
> 
> Since I don't seem to have had the same kind of problems 1 or 2 years ago
> with FreeBSD 8.x and the same drive with the same adapter, I would guess
> that some regression has been introduced or my hardware does not work
> properly any more.
> 
> Moreover I need to connect the drive to my laptop before powering up the
> FreeBSD otherwise it sees sometimes only a USB device with no drive
> attached to it and "camcontrol rescan all" gets stalled until I unplug the
> drive. I am not experiencing this particular problem when connecting the
> drive via a USB hub to my laptop.
> 
> Does somebody have a solution for one of the above?
> 
> Please CC me since I am not subscribed.

Have you tried to use the no-synchronize cache quirk for your drive?

Are you using 8-stable?

--HPS