zfs discuss - Apr 2007 - How to dtrace which process is writting a veritas volume?

Hi all, 

 

How to dtrace a who is writing a veritas volume?

 

Thanks.

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On 4/12/07, Chen, Robert <robertchen at ebay.com>
wrote:
> How to dtrace a who is writing a veritas volume?
May be fuser or lsof is faster to provide the answer??

Rayson



>
>
>
> Thanks.
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>

Rayson Ho wrote:
> On 4/12/07, Chen, Robert <robertchen at ebay.com> wrote:
>> How to dtrace a who is writing a veritas volume?
>
> May be fuser or lsof is faster to provide the answer??
>
> Rayson
>
>
>
>
>>
>>
>>
>> Thanks.
>> _______________________________________________
>> zfs-discuss mailing list
>> zfs-discuss at opensolaris.org
>> http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
>>
>>
> _______________________________________________
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> http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
>
Are you looking for data aggregated on user or process?  For veritas 
filesystems, the io provider doesn''t seem to work terribly well because
veritas will aggregate operations and not be able to report specifically 
which process or file is being written/read.  However, you can use the 
fds[] array and the fileinfo_t structures with syscalls, so you could do 
something like

#pragma D option quiet

syscall::*write*:entry
{
        @[fds[arg0].fi_mount, pid] = sum(arg2);
}

tick-5sec
{
        trunc(@,20);
        
printf("---------------------------------------------------------------------------------------------\n");
        printf("%30s %10s %10s\n", "Mnt Point",
"PID", "Sum(Size)");
        printa("%30s %10d %@10d\n", @);
        
printf("---------------------------------------------------------------------------------------------\n");
        trunc(@);
}


This will give you the top 20 mntpt/pid combinations every 5-seconds and 
then clear the aggregation.  You can create aggregations on individual 
files using fi_pathname instead of fi_mount,  and you can narrow the  
files/mntpts using predicates to the syscall entry.

Put that script in a file and run with dtrace -s <script filename> to 
use it.
-Andy