hi Alan:
2014-07-08 1:02 GMT+08:00 Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>:
> On Tue, 8 Jul 2014, loody wrote:
>
>> > An alternative is to write a positive value, such as 240000, to
>> >
>> > /sys/block/sdX/events_poll_msecs
>> >
>> > where X is replaced with the proper drive letter. (240000 ms = 240 s =
>> > 4 m.) I'm not sure this will work, but it's worth a try.
>>
>> I cannot find events_poll_msecs you mentioned in my system.
>> Is this capability related to kernel version?
>> ( my kernel version is 2.6.38.8 )
>
> Well, the in-kernel disk events mechanism was added in 2.6.38, but it
> may not have been implemented for your type of drive.
You are correct.
i can see events_poll_msecs when I change my kernel to 3.8.0
But the device still disconnect.
I have some question.
1. when I cat /sys/block/sdX/events, I get the answer as media_change.
is there any events type we can choose, such as read capability or inquiry.
>
> Probably you don't actually need to do a read. Simply opening the
> device file ought to be sufficient.
2. the open device you mean is like open(/dev/sda1)?
thanks for all your kind help,
--
Regards,
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