SCSI device not created upon a CF card plug in

[Sagara Wijetunga]

Ivan Voras writes: 

> Milan Obuch wrote:
>> On Wednesday 22 July 2009 09:38:50 Ivan Voras wrote: 
>> 
>> [ snip ] 
>> 
>>>>> After the CF card is plugged in:
>>>>> $ ls -l /dev/ | grep da
>>>>> crw-r-----  1 root    operator    0, 105 Jul 22 13:18 da0
>>>>> crw-r-----  1 root    operator    0, 106 Jul 22 13:18 da1
>>>>> crw-r-----  1 root    operator    0, 107 Jul 22 13:18 da2
>>>>> crw-r-----  1 root    operator    0, 108 Jul 22 13:18 da3 
>>>>> 
>>>>> After reboot while the CF card is plugged in:
>>>>> $ ls -l /dev/ | grep da
>>>>> crw-r-----  1 root    operator    0, 105 Jul 22 13:24 da0
>>>>> crw-r-----  1 root    operator    0, 106 Jul 22 13:24 da1
>>>>> crw-r-----  1 root    operator    0, 110 Jul 22 13:24 da1s1
>>>>> crw-r-----  1 root    operator    0, 107 Jul 22 13:24 da2
>>>>> crw-r-----  1 root    operator    0, 108 Jul 22 13:24 da3 
>>>>> 
>>>>> My questions in this regards are:
>>>>> 1. Is this an error/bug in FreeBSD 7.2?
>>>> This is known limitation of, I think, GEOM stack.
>>> No, it is certainly not. What would be the point? 
>>> 
>> 
>> Please re-iterate :) 
>> 
>> When GEOM is signalled about new device, it tries to understand data 
>> structures - MBR, partition table, etc. The key is 'when signalled'. So 
>> this is not limitation of GEOM per se, just missing signalling of new 
>> device/data media arrival.
> 
> Ah yes, if the reader always signals the device present but doesn't signal 
> media insertion, it would lead to the described problem. 
> 
> I agree there isn't a good solution apart from polling. 
> 

I have earlier posted my tests with Linux. All tests were done with same CF 
cards and the very same multi-card reader on the same computer. They work on 
Linux. That is, nothing wrong with the multi-card reader, it does it's job 
of signaling well. 

Regards
Sagara