On 03/13/2012 12:48 AM, Nataraj wrote:
On 03/12/2012 11:56 PM, George R Goffe wrote:
Hi,
I'm having a bit of a problem with some SATA drives
in docking stations connected to USB ports.
The problem seems to be unrelated to heavy I/O and
occurs randomly. Once, without the drive even being
mounted.
Did this configuration ever work well for you in the past and did
the problem change with any kind of kernel upgrade or
reconfiguration of the drives or cabling?
Unfortunately I've seen this problem way too many times,
especially with multiport Jmicron controlers such as the one that
you have. I've occasonally been able to solve it by changing or
reseating the cabling. Also make sure the drives are firmly
seated in the docking station. On some systems no matter what I
do, if I do simultaneous IO to more than one USB drive I get
errors like this (I know you say it is not IO related). In some
cases it works better to use only a single drive per controller
and plug a second drive into a port on a different usb controller
if your system has more than 1. If it doesn't work in one dock
socket, try the other. Some of the controllers in these multiport
USB peripherals just don't work well with linux drivers or with
the usb controller on a particular computer.
I wish I had a better answer for you, but I think this is a pretty
common problem with this type of commodity hardware. I have some
systems where it seems to work just fine and others where no
matter what I do it won't work.
Nataraj
A couple more thoughts...
If you are using any kind of USB HUB, if possible remove it from the
system while debugging this, certainly don't plug disk drives into
it. I've never found a USB HUB that wasn't flakey.
If you have any way to boot another OS, either dual boot from your
hard drive or any kind of live CD or disk diagnostic live CD, you
might be able to use this to determine if you have actual hardware
problems or just compatability problems between the linux drivers
and your hardware. Of course you might not be able to mount your
linux filesystems, but a good block type of disk diag should be able
to do a read only test of your drives.
Nataraj
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