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Re: 2.6.38: XFS/USB/HW issue, or failing USB stick?

To: Justin Piszcz <jpiszcz@xxxxxxxxxxxxxxx>
Subject: Re: 2.6.38: XFS/USB/HW issue, or failing USB stick?
From: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Date: Fri, 18 Mar 2011 11:39:26 -0400 (EDT)
Cc: linux-usb@xxxxxxxxxxxxxxx, <xfs@xxxxxxxxxxx>, <linux-kernel@xxxxxxxxxxxxxxx>, Alan Piszcz <ap@xxxxxxxxxxxxx>
In-reply-to: <alpine.DEB.2.02.1103181104020.30018@xxxxxxxxxxxxxxxx>
On Fri, 18 Mar 2011, Justin Piszcz wrote:

> Hi,
> 
> I can write to just about the entire USB stick, with no errors:
> 
> atom:~# df -h
> Filesystem            Size  Used Avail Use% Mounted on
> /dev/sda2             5.8G  1.5G  4.3G  26% /
> tmpfs                 2.0G     0  2.0G   0% /lib/init/rw
> udev                   10M  140K  9.9M   2% /dev
> tmpfs                 2.0G     0  2.0G   0% /dev/shm
> atom:~# cd /
> atom:/# ls
> bin   cdrom  etc   lib    media  nfs  proc  sbin     srv  tmp  var
> boot  dev    home  lib64  mnt    opt  root  selinux  sys  usr
> atom:/# dd if=/dev/zero of=bigfile bs=1M count=4000
> 4000+0 records in
> 4000+0 records out
> 4194304000 bytes (4.2 GB) copied, 135.536 s, 30.9 MB/s
> atom:/# df -h
> Filesystem            Size  Used Avail Use% Mounted on
> /dev/sda2             5.8G  5.4G  350M  95% /
> tmpfs                 2.0G     0  2.0G   0% /lib/init/rw
> udev                   10M  140K  9.9M   2% /dev
> tmpfs                 2.0G     0  2.0G   0% /dev/shm
> atom:/# rm bigfile
> 
> However, after some amount of time, the errors occur below, is this USB
> stick failing?  Since it has no SMART, is there any other way to verify
> the 'health' of a USB stick?

None that I know of.

> Mar 18 07:55:12 atom [   10.034310] e1000e 0000:03:00.0: eth1: 10/100 speed: 
> disabling TSO
> 
> [ .. no errors .. ]
> 
> Mar 18 08:32:44 atom [ 2261.883848] usb 1-1: USB disconnect, address 2
> Mar 18 08:32:44 atom [ 2261.884465] Buffer I/O error on device sda2, logical 
> block 1317256

The stick didn't "fail" in any obvious way, but for some reason it was
disconnected from the USB bus.  (If it initiated that disconnect by
itself, I guess you could consider that a failure.)  Maybe it was
something as simple as overheating causing a loss of electrical contact
between the connector and the pins in the USB port.

...
> Mar 18 08:33:06 atom [ 2283.963059] usb 1-1: new high speed USB device using 
> ehci_hcd and address 4
> Mar 18 08:33:06 atom [ 2284.080647] usb 1-1: New USB device found, 
> idVendor=0325, idProduct=ac02
> Mar 18 08:33:06 atom [ 2284.080707] usb 1-1: New USB device strings: Mfr=1, 
> Product=2, SerialNumber=3
> Mar 18 08:33:06 atom [ 2284.080752] usb 1-1: Product: R2_TURBO
> Mar 18 08:33:06 atom [ 2284.080794] usb 1-1: Manufacturer: OCZ Technology
> Mar 18 08:33:06 atom [ 2284.080831] usb 1-1: SerialNumber: (removed)

And then 22 seconds later it reconnected.

Alan Stern

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