The following reply was made to PR usb/150401; it has been noted by GNATS.

From: Hans Petter Selasky <hsela...@c2i.net>
To: freebsd-usb@freebsd.org,
 "Decibel!" <deci...@decibel.org>
Cc: freebsd-gnats-sub...@freebsd.org
Subject: Re: usb/150401: Errors from USB drives mixed between UFS and ZFS
Date: Thu, 9 Sep 2010 08:53:41 +0200

 On Monday 06 September 2010 05:33:09 Decibel! wrote:
 > >Number:         150401
 > >Category:       usb
 > >Synopsis:       Errors from USB drives mixed between UFS and ZFS
 > >Confidential:   no
 > >Severity:       serious
 > >Priority:       medium
 > >Responsible:    freebsd-usb
 > >State:          open
 > >Quarter:
 > >Keywords:
 > >Date-Required:
 > >Class:          sw-bug
 > >Submitter-Id:   current-users
 > >Arrival-Date:   Thu Sep 09 03:00:08 UTC 2010
 > >Closed-Date:
 > >Last-Modified:
 > >Originator:     Decibel!
 > >Release:        FreeBSD 8.1-RELEASE amd64
 > >Organization:
 > 
 > >Environment:
 > System: FreeBSD noel.decibel.org 8.1-RELEASE FreeBSD 8.1-RELEASE #0: Thu
 > Sep 2 19:38:40 CDT 2010 r...@noel.decibel.org:/usr/obj/usr/src/sys/GENERIC
 > amd64
 > 
 > >Description:
 > I have a system with 3 USB drives: 2 are in a zpool mirror (though I've
 > seen the same behavior with them in a simple zpool stripe), one is
 > stand-alone UFS.
 > 
 > I can hit either ZFS or the UFS drive hard (running bonnie++) and things
 > are fine. But as soon as I start hitting both of them, I start getting
 > errors:
 > 
 > Sep  6 03:16:31 noel kernel: (da0:umass-sim0:0:0:0): AutoSense failed
 > Sep  6 03:16:31 noel root: ZFS: vdev I/O failure, zpool=zsb path=/dev/da0
 > offset=1145095418880 size=1024 error=5 (I'll get some number of the second
 > error, usually between 5 and 20 per incident).
 > 
 > The frequency of these errors is dependent on workload. I've been rsyncing
 > some data at a rate of ~500kB/s (rsync --bwlimit=500) and that's
 > generating roughly 3 events per hour:
 > 
 > Sep  6 00:36:00 noel kernel: (da1:umass-sim1:1:0:0): AutoSense failed
 > Sep  6 01:37:11 noel kernel: (da1:umass-sim1:1:0:0): AutoSense failed
 > Sep  6 01:38:25 noel kernel: (da1:umass-sim1:1:0:0): AutoSense failed
 > Sep  6 01:40:02 noel kernel: (da1:umass-sim1:1:0:0): AutoSense failed
 > Sep  6 01:41:03 noel kernel: (da1:umass-sim1:1:0:0): AutoSense failed
 > Sep  6 01:41:34 noel kernel: (da1:umass-sim1:1:0:0): AutoSense failed
 > Sep  6 02:18:27 noel kernel: (da0:umass-sim0:0:0:0): AutoSense failed
 > Sep  6 02:37:36 noel kernel: (da1:umass-sim1:1:0:0): AutoSense failed
 > Sep  6 02:42:30 noel kernel: (da1:umass-sim1:1:0:0): AutoSense failed
 > Sep  6 03:13:30 noel kernel: (da0:umass-sim0:0:0:0): AutoSense failed
 > Sep  6 03:15:38 noel kernel: (da1:umass-sim1:1:0:0): AutoSense failed
 > Sep  6 03:16:31 noel kernel: (da0:umass-sim0:0:0:0): AutoSense failed
 > 
 > The errors are always on the ZFS drives (da0, da1); I haven't seen any on
 > the UFS drive.
 > 
 > deci...@noel.2[22:32]~:15>sudo usbconfig
 > ugen0.1: <OHCI root HUB nVidia> at usbus0, cfg=0 md=HOST spd=FULL (12Mbps)
 > pwr=ON ugen1.1: <EHCI root HUB nVidia> at usbus1, cfg=0 md=HOST spd=HIGH
 > (480Mbps) pwr=ON ugen1.2: <FreeAgent Seagate> at usbus1, cfg=0 md=HOST
 > spd=HIGH (480Mbps) pwr=ON ugen1.3: <FreeAgent Seagate> at usbus1, cfg=0
 > md=HOST spd=HIGH (480Mbps) pwr=ON ugen1.4: <FreeAgent Pro Seagate> at
 > usbus1, cfg=0 md=HOST spd=HIGH (480Mbps) pwr=ON ugen0.2: <USB Mouse
 > Logitech> at usbus0, cfg=0 md=HOST spd=LOW (1.5Mbps) pwr=ON
 > 
 > >How-To-Repeat:
 > Hopefully someone else can repeat this with a similar setup.
 > 
 > >Fix:
 > >Release-Note:
 > >Audit-Trail:
 > 
 > >Unformatted:
 > _______________________________________________
 > freebsd-usb@freebsd.org mailing list
 > http://lists.freebsd.org/mailman/listinfo/freebsd-usb
 > To unsubscribe, send any mail to "freebsd-usb-unsubscr...@freebsd.org"
 
 Hi,
 
 Try to enable quirks on your USB mass storage device, for example no 
 synchronize cache. See man usbconfig and usbconfig -h and kldload usb_quirk.ko
 
 --HPS
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