[lustre-discuss] FIEMAP support for Lustre

Patrick Farrell paf at cray.com
Mon Aug 24 10:34:01 PDT 2015


You should definitely read up on the ticket linked by Frank Zago - It highlights a notable bug in Lustre's fiemap implementation.  Whether or not that affects your intended use, you'll have to decide.

- Patrick
From: lustre-discuss [lustre-discuss-bounces at lists.lustre.org] on behalf of Wenji Wu [wenji at fnal.gov]
Sent: Monday, August 24, 2015 12:32 PM
To: Drokin, Oleg
Cc: lustre-discuss at lists.lustre.org
Subject: Re: [lustre-discuss] FIEMAP support for Lustre


Thanks a lot.

Which version of Luster should I take a look?



On 8/24/15, 11:06 AM, "Drokin, Oleg" <oleg.drokin at intel.com> wrote:

>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.
>    Oleg

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