[lustre-discuss] FIEMAP support for Lustre

[Alexander I Kulyavtsev]

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/artifact/lustre_manual.xhtml#dbdoclet.nrstuning

Lustre multirail:
	http://cdn.opensfs.org/wp-content/uploads/2013/04/LUG13-Presentation-ihara-final-rev4.pdf
	http://cdn.opensfs.org/wp-content/uploads/2012/12/900-930_Diego_Moreno_LUG_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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