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Date:      Mon, 21 Jan 2013 22:44:53 +0100
From:      Hans Petter Selasky <hselasky@c2i.net>
To:        freebsd-current@freebsd.org
Cc:        Alexander Nedotsukov <bland@bbnest.net>
Subject:   Re: ZFS + usb in trouble?
Message-ID:  <201301212244.54025.hselasky@c2i.net>
In-Reply-To: <201301212237.11092.hselasky@c2i.net>
References:  <B9569401-6A19-437C-82D8-794022D42CF1@bbnest.net> <201301212236.04250.hselasky@c2i.net> <201301212237.11092.hselasky@c2i.net>

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On Monday 21 January 2013 22:37:11 Hans Petter Selasky wrote:
> On Monday 21 January 2013 22:36:04 Hans Petter Selasky wrote:
> > On Monday 21 January 2013 22:17:19 Pawel Jakub Dawidek wrote:
> > > I used wrong Hans' login, resending with the proper e-mail.
> > 
> > Hi,
> > 
> > You should try to use some tools to write some random data and read it
> > back and see if the data is the same, at /dev/daX level. The USB wrapper
> > for SCSI is very simple and it passes commands directly from CAM to the
> > hardware. I would be surprised if data was corrupted at this stage.
> 
> Please also check if your USB device suffers from the lack of SYNCHRONIZE
> CACHE.
> 

Hi,

Try this first:

usbconfig -d X.Y add_quirk UQ_MSC_NO_SYNC_CACHE

Re-plug device.

--HPS



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