Re: Mass storage failure during USB2 data transfers

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Hello Alan,

> I looked through your bug report entries.  It seems that the problem
> is getting worse!  You said that recently the resets start occurring
>  immediately, not after 1 GB or so as in the past.

Indeed.

> You also said that the errors leave the drive in an unusable
> condition, requiring a power cycle.  That certainly points to a bug
> in the drive or the USB-IDE interface firmware.  A bug on the
> computer end wouldn't leave the drive hung with its LED blinking.

Could be, however it depends on a kernel version. Vanilla kernel from
Linus hangs the drive, Mandriva's kernel doesn't for some reason when
this error occurs.

> You mentioned that it works correctly over the Firewire connection.
>  That means nothing; 
...

> You mentioned that the drive works okay under Windows.  It's hard to
>  say how relevant that is; 
...

The relevance of this was to the Mandriva maintainer to say that a) the
disk inside is OK, b) the enclosure itself is not fried.

The enclosure used to work OK with older kernel revisions, the problems
started after a kernel update in the Mandriva revision in the report.

> If you want to gather more information about the problem, you can try
>  using the usbmon facility.  Instructions are in the kernel source
> file Documentation/usb/usbmon.txt.

I have done so, the report with the /var/log/messages is at:
http://www.aaue.dk/~janoc/files/download/usb/

I have tried to copy an approx 700MB with an old Knoppix ISO image to
the disk. After this error the drive was not completely blocked, but I
have received the following after unplugging the USB cable and plugging
it back:

usb 1-4: new high speed USB device using ehci_hcd and address 6
usb 1-4: device not accepting address 6, error -71
usb 1-4: new high speed USB device using ehci_hcd and address 7
usb 1-4: device not accepting address 7, error -71
usb 1-4: new high speed USB device using ehci_hcd and address 8
usb 1-4: device descriptor read/64, error -71
usb 1-4: device descriptor read/64, error -71
usb 1-4: new high speed USB device using ehci_hcd and address 9
usb 1-4: device descriptor read/64, error -71
usb 1-4: device descriptor read/64, error -71
...

Only power-cycling the drive managed to recover it.

Regards,

Jan

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