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From: Hans Petter Selasky <hselasky@c2i.net>
To: freebsd-current@freebsd.org
Subject: Re: ZFS + usb in trouble?
Date: Mon, 21 Jan 2013 22:44:53 +0100
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Cc: Alexander Nedotsukov <bland@bbnest.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