[nSLUG] USB storage hot-swap question

[Rich]

I've tried stick reader and hub reader - I get some issues with kernel 
freezing, but I think its a bug in the udev rules. (need some time to 
troubleshoot).

The problem may be that the CONFIG_SCSI_MULTI_LUN may not be compiled 
into the kernel.
Not sure if its available in 2.4 kernel.

I had some issues with CONFIG_BLK_DEV_UB being enabled, so I disabled 
that and no more issues with device assignment.
Also, this CONFIG_USB_LIBUSUAL should be enabled as well.

See if you have a /proc/config.gz  - this may only be for 2.6 kernels 
(there is an option now to save a copy of the config in the kernel)


I find udev/hal works much better than hotplug ever did.  :)

BTW, Slackware 12.1 is out. 
I've been using the beta for a while, its worth the update, lots of 
fixes and cleanup.


Rich

Luke Gavel wrote:
> Has anyone tried this with any USB stick other than the Kingston 2GB Data Traveler USB Flash Drive (DTI-2GBCR)?  This problem might not be only on Linux OSes, and could be the reason that FutureShop is advertising a huge discount sale for these Kingston drives...
>
> --- On Sat, 5/17/08, Mike Spencer <mspencer at tallships.ca> wrote:
>
>   
>> From: Mike Spencer <mspencer at tallships.ca>
>> Subject: [nSLUG]  Re: USB storage hot-swap question
>> To: nslug at nslug.ns.ca
>> Received: Saturday, May 17, 2008, 2:51 PM
>> I wrote:
>>
>> me> But if I umount the [USB memory] device, unplug it
>> and plug in
>> me> another device, mount refuses to mount it, reporting
>> that it is
>> me> "is not a valid block device".
>>
>>
>> And "George N. White III"
>> <gnwiii at gmail.com> quoth:
>>
>>     
>>> I haven't seen this (on 2.6.24.7-92.fc8). The
>>>       
>> entry in
>>     
>>> /proc/scsi/scsi disappears when the device is
>>>       
>> unplugged from the USB
>>     
>>> connector.
>>>       
>> Oh. Well, I'm using a 2.4 kernel.  USB webcam works as
>> advertized and USB
>> memory works but doesn't hot-swap properly.
>>
>>     
>>> A certain well-known direct vendor is notorious for
>>>       
>> USB ports that
>>     
>>> don't behave.
>>>       
>> This is an IBM P3. "Type 6579 GJU" if the xternal
>> sticker is to be
>> believed. 
>>
>>     
>>> Do you see lines in /var/log/messages like:
>>>
>>>   May 17 14:41:50 cerberus kernel: usb 1-5: USB
>>>       
>> disconnect, address 4
>>
>> After unmounting and removing one device, then plugging in
>> and
>> attempting to mount another, /var/log/messages has:
>>
>>     May 17 15:23:09 bogus kernel: usb.c: USB disconnect on
>> device
>>                     00:1f.2-2 address 5
>>     May 17 15:23:28 bogus kernel: hub.c: new USB device
>> 00:1f.2-2,
>>                     assigned address 6
>>     May 17 15:24:02 bogus kernel: sda: Unit Not Ready,
>> sense:
>>     May 17 15:24:02 bogus kernel:  sda: I/O error: dev
>> 08:00, sector 0
>>
>> Does that tell you anything useful?
>>
>>     
>>> You might be interested in
>>>       
>> <http://www.linux-usb.org/usbtest/>....
>>
>> Yow!  That makes it look like the whole USB matter is a can
>> or worms
>> under the hood.  Browsing over it, I gather I should
>> upgrade to a 2.6
>> kernel RSN.  Well, I just bought a used Dell P4 on which
>> I'm going to
>> install Slack 12/2.6 kernel. (Or was it Dell that you
>> called "A
>> certain well-known direct vendor...notorious for USB ports
>> that don't
>> behave."?)
>>
>> So maybe I'll just live with this hot-plug annoyance
>> until I have that
>> up and running.
>>
>>
>> Thanks,
>> - Mike
>>
>> -- 
>> Michael Spencer                  Nova Scotia, Canada      
>> .~. 
>>                                                           
>> /V\ 
>> mspencer at tallships.ca                                    
>> /( )\
>> http://home.tallships.ca/mspencer/                       
>> ^^-^^
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>>     
>
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