[lustre-discuss] FIEMAP support for Lustre

[Wenji Wu]

Alex,

Thanks,

I understand the Lustre stripe concept. I just try to understand if lustre
support FIEMAP between Luster client and server.

wenji

On 8/24/15, 2:34 PM, "Alexander I Kulyavtsev" <aik at fnal.gov> wrote:

>Wenji,
>you may take a look at
>	1.3.  Lustre File System Storage and I/O
>and 
>	1.3.1.  Lustre File System and Striping
>Commands 
>	lfs getstripe
>	lfs setstripe
>
>Lustre Network Request Scheduler
>	https://build.hpdd.intel.com/job/lustre-manual/lastSuccessfulBuild/artifa
>ct/lustre_manual.xhtml#dbdoclet.nrstuning
>
>Lustre multirail:
>	http://cdn.opensfs.org/wp-content/uploads/2013/04/LUG13-Presentation-ihar
>a-final-rev4.pdf
>	http://cdn.opensfs.org/wp-content/uploads/2012/12/900-930_Diego_Moreno_LU
>G_Bull_2011.pdf
>These are actually server side. IIRC you are looking on client side.
>
>Best regards, Alex.
>
>On Aug 24, 2015, at 11:06 AM, Drokin, Oleg <oleg.drokin at intel.com> wrote:
>
>> Hello!
>> 
>> On Aug 24, 2015, at 11:57 AM, Wenji Wu wrote:
>> 
>>> Hello, everybody,
>>> 
>>> I understand that ext2/3/4 support FIEMAP to get file extent mapping.
>>> 
>>> Does Lustre supports similar feature like FIEMAP? Can Lustre client
>>>gets FIEMAP-like information on a Luster file system?
>> 
>> Yes, Lustre does support fiemap.
>> You can see patched ext4progs and the filefrag included there works on
>>top of Lustre too, as an example.
>> 
>> lustre/tests/checkfiemap.c in the lustre source tree is another example
>>user of this functionality that you can consult.
>> 
>> Bye,
>>    Oleg
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>