[ale] unmount problem

[Damon L. Chesser]

On 12/07/2013 05:46 AM, Horkan Smith wrote:
> Sean, you might try
>
> # fuser /path/media/drive
>
> as well, that should give you the PID of the process that's hanging you up.
>
> Not sure if that uses the same info as the lsof cmd though....
>
> Damon, wouldn't a lazy umount like that run the risk of it *looking* like it's unmounted, but not really *be* unmounted?

Not in my experience, but you could do a mount command and verify 
after.  And better still, sync wrote all files in the buffer to disk, so 
if you yank the drive, you get no data loss.  I suspect either the file 
manager is holding it open (are you in that dir?) or a term is holding 
it open (same, are you in that dir).  I thought about fuser, just cause  
it was fun to say to customers and keep a straight face.  it would tell 
you the PID, then you can nuke it. But I took the tack that I would want 
it umounted, processes be damned and sync; umount -l would do that.  
Plus, IIRC, umount -l will report a problem with unmounting it if it 
failed. The risk of lazy umount is data loss due to not writing buffers 
and processes reading blowing up.  It is a big hammer.


>
> later!
>     horkan
>
> On Thu, Dec 05, 2013 at 04:18:39PM -0500, Damon L. Chesser wrote:
>> On 12/05/2013 04:10 PM, Sean Kilpatrick wrote:
>>> On Thursday, December 05, 2013 03:53:27 pm Damon L. Chesser wrote:
>>>
>>>> sync; umount -l (or L, I forget) /path/media/drive
>>> duh! [palm slaps forehead]
>>>
>>> that worked.
>>>
>> Don't feel bad, umount -l is not well known as it is seldom used.
>>
>>> tnx
>>>
>>> sean
>>>
>>>
>>>
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>>
>> -- 
>> Damon L. Chesser
>> damon at damtek.com
>> http://www.linkedin.com/in/dchesser
>>
>>
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-- 
Damon L. Chesser
damon at damtek.com
http://www.linkedin.com/in/dchesser