[lustre-discuss] OST -> MDT migration and MDT -> OST migration

[Thomas Roth]

On 4/15/21 5:12 AM, Andreas Dilger via lustre-discuss wrote:
> On Apr 14, 2021, at 18:42, Bill Anderson via lustre-discuss <lustre-discuss at lists.lustre.org<mailto:lustre-discuss at lists.lustre.org>> wrote:
> 
> 
>     Hi All,
> 
>     I'm trying to figure out how to migrate files stored on an OST to an MDT (that's using DoM) and to migrate files stored on an MDT to an OST (e.g., if the MDT is getting full).  I can see how to migrate between OSTs, but not between OSTs and MDTs.  I'm running Lustre 2.12.3.
> 
>   Do you happen to know the syntax for migration between OSTs and MDTs?
> 
>     Thanks for any help!

> You just use "lfs migrate <file layout> <file>" to migrate from DoM files to OST objects.  However, OST-to-DoM migration isn't available until 2.13.
> 
> Cheers, Andreas
> --
> Andreas Dilger
> Principal Lustre Architect
> Whamcloud
> 
> 

But what about "20.2.2. Setting a default DoM layout to an existing directory" = create a  new directory with a default DoM layout and copy your files 
to that directory. Should they not receive an MDT-component automatically?

Regards,
Thomas

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