[Lustre-discuss] What exactly is punch statistic?

[Oleg Drokin]

Hello!

   No, it's not a bad thing. It's just another operation like others.
   When apps do truncate() call, the punch RPCs happen.
   When apps do open(O_TRUNC) call, the punch RPCs happen too.

Bye,
    Oleg
On Jun 18, 2011, at 12:28 AM, Mervini, Joseph A wrote:

> Hi Cliff - it's been a long time...
> 
> It seems to me that file truncation is a bad thing - i.e., file writes are not completed. Is this an invalid assessment?
> 
> Thanks,
> Joe
> ==
>  
> Joe Mervini
> Sandia National Laboratories
> Dept 09326
> PO Box 5800 MS-0823
> Albuquerque NM 87185-0823
>  
> 
> On Jun 16, 2011, at 12:52 PM, Cliff White wrote:
> 
>> It is called when truncating a file - afaik it is showing you the number of truncates, more or less. 
>> cliffw
>> 
>> 
>> 
>> On Thu, Jun 16, 2011 at 10:52 AM, Mervini, Joseph A <jamervi at sandia.gov> wrote:
>> Hi,
>> 
>> I have been covertly trying for a long time to find out what punch means as far a lustre llobdstat output but have not really found anything definitive.
>> 
>> Can someone answer that for me? (BTW: I am not alone in my ignorance... :) )
>> 
>> Thanks.
>> ====
>> 
>> Joe Mervini
>> Sandia National Laboratories
>> High Performance Computing
>> 505.844.6770
>> jamervi at sandia.gov
>> 
>> 
>> 
>> 
>> _______________________________________________
>> Lustre-discuss mailing list
>> Lustre-discuss at lists.lustre.org
>> http://lists.lustre.org/mailman/listinfo/lustre-discuss
>> 
>> 
>> 
>> -- 
>> cliffw
>> Support Guy
>> WhamCloud, Inc. 
>> www.whamcloud.com
>> 
>> 
> 
> _______________________________________________
> Lustre-discuss mailing list
> Lustre-discuss at lists.lustre.org
> http://lists.lustre.org/mailman/listinfo/lustre-discuss

--
Oleg Drokin
Senior Software Engineer
Whamcloud, Inc.