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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rmmount

rmmount(1)							   User Commands							rmmount(1)

NAME

       rmmount, rmumount - mounts and unmounts removable media

SYNOPSIS

       rmmount	[-u] [-o options] [nickname | device] [mount_point]

       rmmount	[-d] [-l]

       rmumount  [nickname | mount_point | device]

       rmumount  [-d] [-l]

DESCRIPTION

       The  rmmount  and rmumount utilities mount and unmount removable or hot-pluggable volumes. The optional argument can identify the volume by
       its volume label, mount point or block device path.

       rmmount can also take additional mount options if the user has sufficient privileges to override the default mount options.

       Unmounting removable media does not result in its ejection. Use eject(1) to optionally unmount and eject the media.

OPTIONS

       The following options are supported for rmmount and rmumount:

       -d    Display the device path of the default device. This device is used if no arguments are supplied.

       -l    Display the paths and nicknames of mountable devices.

       The following options are supported for rmmount only:

       -o options    Display mount options. This option can only be used by users that have privileges to override the system default options.

       -u	     Unmounts the volume as opposed to mounting it.

OPERANDS

       The following operands are supported:

       device	      Specifies which device to mount or unmount, by the name it appears in the  directory /dev.

       mount_point    Specifies which device to mount or unmount, by the name it appears in the  directory /dev.

       nickname       Specifies which device to mount or unmount, by its nickname as known to  this command.

EXAMPLES

       Example 1 Mounting a USB disk

       The following example mounts a USB disk with a volume label of PHOTOS:

	 example% rmmount PHOTOS

       Example 2 Unmounting a pcfs Volume

       The following example unmounts a pcfs volume by device path:

	 example% rmumount /dev/dsk/c4t0d0p0:1

EXIT STATUS

       The following exit values are returned:

       0     Successful completion.

       >0    An error occurred.

FILES

       /media	 Default mount root.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWrmvolmgr		   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Uncommitted		   |
       +-----------------------------+-----------------------------+

SEE ALSO

       eject(1), attributes(5)

SunOS 5.11							    18 Sep 2006 							rmmount(1)