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    SubjectRe: Problems with USB disk [solved]
    On 08/13/2007 10:50 AM, Niels wrote:
    > On Sunday 12 August 2007 11:54, Niels wrote:
    >
    >> On Friday 10 August 2007 14:43, Niels wrote:
    >>
    >>> On Wednesday 08 August 2007 12:57, Ismail Dönmez wrote:
    >>>
    >>>> On Wednesday 08 August 2007 13:48:29 you wrote:
    >>>>> On Tuesday 07 August 2007 23:18, Greg KH wrote:
    >>>>>> On Tue, Aug 07, 2007 at 10:26:15PM +0200, Niels wrote:
    >>>>>>> Hi,
    >>>>>>>
    >>>>>>> I'm having problems with a new 500 GB USB disk. It works, but
    >>>>>>> sometimes I get these in dmesg:
    >>>>>>>
    >>>>>>>
    >>>>>>> usb 1-3: reset high speed USB device using ehci_hcd and address 2
    >>>>>>> usb 5-1: USB disconnect, address 2
    >>>>>>> drivers/usb/class/usblp.c: usblp0: removed
    >>>>>>> sd 0:0:0:0: Device not ready: <6>: Sense Key : 0x2 [current]
    >>>>>>>
    >>>>>>> : ASC=0x4 ASCQ=0x2
    >>>>>>>
    >>>>>>> end_request: I/O error, dev sda, sector 254148215
    >>>>>>> sd 0:0:0:0: Device not ready: <6>: Sense Key : 0x2 [current]
    >>>>>>>
    >>>>>>> : ASC=0x4 ASCQ=0x2
    >>>>>>>
    >>>>>>> end_request: I/O error, dev sda, sector 252434023
    >>>>>>> EXT3-fs error (device sda1): ext3_find_entry: reading directory
    >>>>>>> #15761836 offset 0
    >>>>>>>
    >>>>>>>
    >>>>>>> There's also a printer connected. This is on a pci/usb2 card. When
    >>>>>>> the above happens, I get I/O errors. When I mount the drive next,
    >>>>>>> there are errors and often missing files. Quite annoying!
    >>>>>>>
    >>>>>>> Kernel is 2.6.21
    >>>>>>>
    >>>>>>> What's going on?
    >>>>>> You have a low voltage issue, or a bad cable. The device is
    >>>>>> electronically disconnecting itself. Try using a externally-powered
    >>>>>> hub, or a new cable.
    >>>> I am seeing a similar problem with 2.6.22 and 2.6.23-* kernels with my
    >>>> 60G iPod Video, works fine with 2.6.18 kernel though.
    >>>>
    >>>
    >>> So far I'm seeing this:
    >>>
    >>> - On 2.6.21 I mount the drive. After a while it spins down, and when I
    >>> then unmount it, an error pops up in dmesg.
    >>>
    >>> - On 2.6.18 I can't provoke the same error. The drive doesn't appear to
    >>> spin down. I don't know if the data corruption from 2.6.21 occurs with
    >>> regular use.
    >>>
    >>> There are a number of other factor I need to eliminate on my system, but
    >>> that's it so far. CONFIG_USB_SUSPEND is not set on either kernel.
    >>
    >> OK, on a vanilla 2.6.18.8 I also have this problem, with both the pci/usb2
    >> card, and the usb1 on the board. I listen to music from the drive, and
    >> after some time (10-20 minutes or so), it freaks out:
    >>
    >> =========
    >> sd 1:0:0:0: Device not ready: <6>: Current: sense key=0x2
    >> ASC=0x4 ASCQ=0x2
    >> end_request: I/O error, dev sda, sector 126693711
    >> sd 1:0:0:0: Device not ready: <6>: Current: sense key=0x2
    >> ASC=0x4 ASCQ=0x2
    >> end_request: I/O error, dev sda, sector 126693711
    >> sd 1:0:0:0: Device not ready: <6>: Current: sense key=0x2
    >> ASC=0x4 ASCQ=0x2
    >> end_request: I/O error, dev sda, sector 126693711
    >> =========
    >>
    >
    > Using a new PSU and a powered hub made no difference. But I found a solution
    > here:
    >
    > http://alienghic.livejournal.com/382903.html
    >
    > Basically, the problem is, as suspected, that the drive spins down / goes to
    > suspend. This can be disabled with "sdparm --clear STANDBY -6 /dev/sda".
    >
    > It seems to me to be an error that the kernel reports this as something like
    > a hardware failure. Or at least very misleading.
    >

    Oh, nice. The usb-storage (SCSI) disk spins itself down and we can't handle that.
    Should we be disabling auto-spindown when we connect the device, or be able to
    handle this by sending the start command when needed?

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