At Mon, 25 May 2009 12:53:55 -0700 CentOS mailing list centos@centos.org wrote:
On Mon, May 25, 2009 at 09:24:03PM +0200, Dag Wieers wrote:
On Mon, 25 May 2009, Dag Wieers wrote:
On Mon, 25 May 2009, Ray Van Dolson wrote:
On Mon, May 25, 2009 at 11:17:30AM -0700, Ray Van Dolson wrote:
Can anyone advise me on how I can tell my system the above device is a mass storage device? Do I need to write some udev rules?
Sorry for replying to my own post, but upon further investigation, it appears that perhaps the usb-storage module doesn't have the correct matching pattern in place to detect this as a mass storage device:
udevmonitor reports the device having a module alias of:
usb:v0451p6250d0300dcFFdsc00dp00icFFisc00ip00
And modinfo usb-storage shows:
# modinfo usb-storage | grep v045 alias: usb:v045Ap5210d0101dc*dsc*dp*ic*isc*ip* alias: usb:v0457p0151d0100dc*dsc*dp*ic*isc*ip* alias: usb:v0457p0150d0100dc*dsc*dp*ic*isc*ip* alias: usb:v0451p5416d0100dc*dsc*dp*ic*isc*ip*
Which obviously won't match. So the question is, how do I add a new alias to the module? And will the module even support my device?
Just a wild an crazy idea, how about adding it to /etc/modprobe.conf ?
alias usb:v0451p6250d0300dcFFdsc00dp00icFFisc00ip00 usb-storage
Not sure if it makes sense, but it's worth trying :)
After doing some research it seems that this is valid, if you perform:
modprobe -c
you get an identical list for all known devices. So adding yours should definitely help.
PS What kind of LaCie disk is it ? I recently bought a 500GB LaCie Little Disk and that one worked fine.
I actually did try adding the above alias line with no luck although the following command:
modprobe -v -n --first-time usb:v0451p6250d0300dcFFdsc00dp00icFFisc00ip00
Now shows a "match". I'm beginning to think the kernel doesn't support this device, or isn't properly exposing it to /sys as it should be.
I added a udev rule:
BUS=="usb",ACTION=="add",SYSFS{idVendor}=="0451",SYSFS{idProduct}=="6250",RUN+="/sbin/modprobe usb-storage",NAME="walter"
And when I plug in my device, I get the following entry under /dev:
crw------- 1 root root 189, 19 May 25 12:02 /dev/walter
Obviously this isn't major type 8 which I would expect to see for a disk... also:
With udevmonitor on my Fedora machine, I see a device created with major type 189, but then later, a SCSI device is detected and a device of major type 8 is set up. This doesn't happen on CentOS, only the 189 device is created.
Also, on my Fedora system the vendor id and Product ID's are different.
Fedora:
059f:0527 LaCie, Ltd
Cent:
0451:6250 Texas Instruments, Inc.
What are the kernel versions?
So I'm beginning to think that the kernel is sending "incorrect" or dated information into /sys and the event sent to udev is either misleading or incomplete somehow.
It's a 500GB "Big Disk".
I'll keep poking around... thanks for the reponse. :)
Ray _______________________________________________ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos