On Apr 15, 2021, at 00:52, Åke Sandgren <[email protected]> wrote: > > > >> 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 >> <[email protected] >> <mailto:[email protected]>> 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
Yes, and that's what happens in 2.13 when this functionality is implemented. To migrate from DoM->OST you can just make a copy of the file and swap layouts. The issue in 2.12 is that you can't write into the MDT inode to do OST->DoM migration/mirroring. Cheers, Andreas _______________________________________________ lustre-discuss mailing list [email protected] http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org
