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Date:      Tue, 17 Nov 2009 10:50:36 -0500
From:      David Jackson <djackson452@gmail.com>
To:        freebsd-questions@freebsd.org
Subject:   Re: Lockup problems with USB disks
Message-ID:  <4B02C64C.3020207@gmail.com>
In-Reply-To: <4B02B0AE.3040801@gmail.com>
References:  <4B02B0AE.3040801@gmail.com>

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I apologise if this was posted more than once, for some reason the 
emails i sent were not reflected back to me, so i assumed they had not 
gone through , i checked the archive on the web page and they were there.
For some reason some messages are not coming through on my gmail account.


David Jackson wrote:
>
> I have a USB hard drive.  Whenever I open two programs which utilise 
> the USB hard drive simultaneously, these programs, i assume when they 
> attempt to write to the hard drive lock up due to what i suspect must 
> be some issue with the USB driver and perhaps a deadlock involving 
> multiple concurrent accesses to the drive. When they attempt to access 
> the drive the programs can lock up for several minutes before being 
> unblocked. When only one program is using the drive this behaviour 
> does not seem to occur.
>
> It seems most likely that this is a USB level problem involving the 
> USB drivers. I am using FreeBSD 7.1. It is annoying behaviour to say 
> the least and I wonder what can be done about it, and if this issue is 
> being addressed, perhaps in the recent redesign of the USB code. It 
> seems to be a pretty consistent issue, happening with multiple 
> installs of FreeBSD and different drives.
>
> Thank you.




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