Fwd: How to WIPE Service with D+ STAT

[Rick Stevens]

alok pandey wrote:
> HI Rick,
> Thanks for your time but I am already aware of what you have stated, I am
> more ,about my other queries, i.e
>  --Remove/reload/wipe process who's ps output comes with D+ stat

You really can't.  A process in a D state is in an I/O wait state.
Until that I/O is satisfied (disk, network, keyboard, whatever), the
process will remain.  The only way out is to either give it the I/O it
wants or reboot.  Sorry.

> --How to trace running  script/process  , were it is blocked/hold (basically
> exact line of script), (any combination of linux command)

You can use the "-p <pid>" option of strace to attach to and trace a
running process.

> --process/users details of using  resource ( disk partition, memory, files,
> etc) .(other than fuser)?.

Have you looked at ac/accton/last/sa and their kin?  Brief HOWTO:

	http://tldp.org/HOWTO/Process-Accounting/index.html

Also have a look at sar and it's bits and pieces.

Note that bottom posting is preferred on this and most of the other Red
Hat/Fedora mailing lists.

> It will be a great help to me if you (or any one) can provide me a pointer
> regarding the same.
> Btw,
> Thanks again for your support.
> 
> --Alok
> 
> 
> On 4/10/09, Rick Stevens <ricks at nerd.com> wrote:
>> alok pandey wrote:
>>
>>> Hi
>>> Recently I experienced a problem on one of  user-desktop machine
>>> (centos5.2), when a user(with all access) deleted the file
>>>  /var/log/messages  to free some space (as  df -h was showing /var 100%
>>> full), but still df -h shows 100% full.
>>> It takes around 10 min to figure out the problem. To resolve it, I just
>>> reloaded the syslog service. ( I was luck that user told me what he did
>>> before, otherwise I am sure it will  take min of 1 to 2 hour )
>>>
>>>
>>> I want to know that is there any way to get perfect details of such
>>> misguiding output. (one i know is fuser, but i didn't find it's helpful).
>>>
>>> To be more specific about problem I want to know ,Is there any way in
>>> Linux(centos) to do the following :-
>>> --Remove/reload/wipe process who's ps output comes with D+ stat
>>> --How to trace running  script/process  , were it is blocked/hold
>>> (basically
>>> exact line of script)
>>> --process/users details of using  resource ( disk partition, memory,
>>> files,
>>> etc) .
>>>
>> When you free up space in a directory, all of the files in that
>> directory must be closed before the free space will appear.  As long as
>> a program holds an open file there, the free space won't appear.
>>
>> In your case, syslog was holding /var/log/messages open so the free
>> space was hidden.  When you restarted syslog, it closed
>> /var/log/messages allowing the true state of things to appear.  It then
>> reopened the file and life continues.

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- Rick Stevens, Systems Engineer                      ricks at nerd.com -
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-                   To err is human, to moo bovine.                  -
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