[lustre-devel] question about mapping of file to object

[pierce liu]

On Wed, Dec 11, 2013 at 4:35 PM, Dilger, Andreas
<andreas.dilger at intel.com>wrote:

> On 2013/12/10 1:56 AM, "pierce liu" <netgridx at gmail.com> wrote:
> >I am a new beginner of lusterfs. During browsing the source code, I am
> >puzzled about how to map file to multi-object. Is there any document for
> >that, or how to trace the code.
>
> Hi Pierce,
> there is a general overview of Lustre at Wikipedia.  There are also quite
> a few presentations available online, and videos on Youtube describing
> the basics of Lustre.
>
> Will see them.


> The filesystem namespace is held on the MDT.  Each inode has a "Logical
> Object Volume" (LOV) xattr (struct lov_mds_md_v1 or struct lov_mds_md_v3)
> that describes the mapping to OST objects.  When a client opens a file on
> the MDT, the LOV xattr is returned to the client, which describes they
> layout of the file (stripe count, stripe size) and the OST objects that
> hold the file data.  After that point, the client does IO directly to the
> OSTs.
>
>  Thanks for the clear explanation. I will trace the code and enjoy it.

>BTW, is this mailing list the effective one for lusterfs, or we have
> >other list?
>
> This list is fine.
>

I saw "linux-2.6/drivers/staging/lustre/TODO" , CCing hpdd-discuss <
hpdd-discuss at lists.01.org> would be great too.
So that list is just for linux-luster-client? Or add this mailling list on
the TODO too, so more people can be involved in?

Thanks and regards,
Pierce
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