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

Åke Sandgren ake.sandgren at hpc2n.umu.se
Wed Apr 14 23:52:48 PDT 2021

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.

Couldn't you just use lfs mirror extend with a PFL that points into the
DoM, and then a resync/split

Ake Sandgren, HPC2N, Umea University, S-90187 Umea, Sweden
Internet: ake at hpc2n.umu.se   Phone: +46 90 7866134 Fax: +46 90-580 14
Mobile: +46 70 7716134 WWW: http://www.hpc2n.umu.se

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