[lustre-discuss] FIEMAP support for Lustre

[Drokin, Oleg]

Hello!

   fiemap is not implemented on ZFS backends at this time.

Bye,
    Oleg
On Aug 24, 2015, at 3:22 PM, Alexander I Kulyavtsev wrote:

> Hi Oleg,
> does ZFS based lustre supports FIEMAP?
> 
> We have lustre 2.5 with zfs installed. Otherwise we will need to setup separate test system with ldiskfs.
> 
> But: please review separate reply, I think this can be addressed through multirail, NRS, file striping.
> 
> 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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