Understanding dmesg and usb hardware mounting Post: 302481419

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Operating Systems Solaris Understanding dmesg and usb hardware mounting Post 302481419 by striker0010 on Friday 17th of December 2010 12:20:06 PM

12-17-2010

Registered User

Understanding dmesg and usb hardware mounting

The Scenario:

Solaris 8 box with USB ports on mobo. Two USB devices both fat32 filesystems and mount with the fs type pcfs, device A is a USB thumb drive (1gb), device B is a External HDD (500gb). Insert device A into a usb port; use dmesg output to find the device path (usb@a/storage@2#). Look at ls -l /dev/dsk grep storage@2# to find out what c#t#d#s# disk that device is tied to. Mount the device (/mnt/usb); ls to check; unmount device (umount /mnt/usb). Unplug device A.

This all works fine, now pull device A out and insert device B into the same USB port. Run dmesg and this is the output

dmesg output

Code:

Dec 17 15:10:54 ubox usba: [ID 349649 kern.info] usba:    offlining scsa2usb1 failed (-5)
Dec 17 15:10:54 ubox usba: [ID 464422 kern.warning]  WARNING: /pci@1e,600000/usb@a/storage@2 (scsa2usb1): Cannot access device. Please reconnect SanDisk, U3 Cruzer Micro, 3349530F3010A88F

Now if I try and repeat the mounting steps over for deviceB it will not mount I get a message along the lines of no disk, however if I pull it reinsert device A then run the same mount command it works fine.

Each time I pull out a usb device I see that offlining scsa2usb1 failed (-5) message.

To me it seems like I am not properly closing out of the device, and it is being cached. The only way to solve this problem I have found thus far is a restart. But after the first device either A or B had been mounted then unmount and replaced I hit the same issue.

Things that I have tried to fix this.
eject /dev/dsk/c#t#d#s# where the numbers map to the usb device
eject /mount point
cfgadm -C
stoping and starting volmgt
calling vold

P.S. My system will not automount to /rmdisk infact that dir does not exist on my root

Questions:
1.) What am I doing wrong here, is it in the unmounting?
2.) What is offlining and why does it fail?
3.) Does some cache of connected devices exist and can it be reset?
4.) Is there a way to cycle the power in the USB port or internal hub to reset device mappings, if so how?

Last edited by striker0010; 12-17-2010 at 01:23 PM.. Reason: Left out questions

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lsusb(8)							Linux USB Utilities							  lsusb(8)

NAME

       lsusb - list USB devices

SYNOPSIS

       lsusb [ options ]

DESCRIPTION

       lsusb is a utility for displaying information about USB buses in the system and the devices connected to them.

OPTIONS

       -v, --verbose
	      Tells lsusb to be verbose and display detailed information about the devices shown.  This includes configuration descriptors for the
	      device's current speed.  Class descriptors will be shown, when available, for USB device classes including hub, audio, HID, communi-
	      cations, and chipcard.

       -s [[bus]:][devnum]
	      Show only devices in specified bus and/or devnum.  Both ID's are given in decimal and may be omitted.

       -d [vendor]:[product]
	      Show only devices with the specified vendor and product ID.  Both ID's are given in hexadecimal.

       -D device
	      Do  not  scan  the /dev/bus/usb directory, instead display only information about the device whose device file is given.	The device
	      file should be something like /dev/bus/usb/001/001.  This option displays detailed information like the v option; you must  be  root
	      to do this.

       -t     Tells lsusb to dump the physical USB device hierarchy as a tree. This overrides the v option.

       -V, --version
	      Print  version information on standard output, then exit successfully.

RETURN VALUE

       If the specified device is not found, a non-zero exit code is returned.

FILES

       /var/lib/usbutils/usb.ids
	      A list of all known USB ID's (vendors, products, classes, subclasses and protocols).

SEE ALSO

       lspci(8), usbview(8).

AUTHOR

       Thomas Sailer, <sailer@ife.ee.ethz.ch>.

usbutils-007							    6 May 2009								  lsusb(8)