[lustre-discuss] FIEMAP support for Lustre
Alexander I Kulyavtsev
aik at fnal.gov
Mon Aug 24 12:22:09 PDT 2015
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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