Ah, if I had only read on one mail I would have seen this procedure is far more complex than described in the Operations Manual. I suppose that's one of the benefits of an object based FS. ---------------- John White High Performance Computing Services (HPCS) (510) 486-7307 One Cyclotron Rd, MS: 50B-3209C Lawrence Berkeley National Lab Berkeley, CA 94720
On Jun 18, 2009, at 10:58 PM, John White wrote: > On Jun 17, 2009, at 4:09 PM, Adam Knight wrote: > >> Pertaining to your original email, rather than taking the MDT down to >> backup, it is very convenient to use LVM snapshots. With this >> functionality it creates a LV duplicate of the MDT and allows you to >> mount that as ldiskfs and backup files from a consistent copy (won't >> be >> changing even if your MDT continues to add/remove data). Your lustre >> filesystem will therefore stay operational during the backup. If you >> time it cleverly, you can snapshot your MDT and OSTs at the same time >> and backup from all of them to have a consistent copy of the whole >> filesystem as well. >> > > So following this, has anyone migrated an MDT to new storage with this > sort of procedure? > > -create an lvm'd MDT that produces snapshots > -use it for a while in production > -get some snazzy new disk > -shutdown lustre > -take a snapshot of the MDT and shuffle it off to some different > storage media > -create a new LVM with snazzy new disk (specifically of a different > size from the original MDT) > -restore snapshot > -run lfsck for good measure (is this advisable on what could feasibly > be a clean filesystem?) > -bring up lustre > > Please keep in mind, I've used LVM but haven't used snapshots, I'm not > familiar with their limitations. We're looking to create a filesystem > immediately but would like to get some much faster storage for the MDT > later without burning and building a new FS. > >>> Thanks for this verbose reply. It is exactly what I needed and >>> what I suspected I would run into. We are planning on multiple >>> backup procedures. Users will backup at checkpoints in their work >>> flow, IT will backup the MDT nightly and we are also looking at the >>> possibility of backup the complete file system. >>> >>> Thanks again for everyone's input, this gives me some good >>> ammunition going forward for proposals. >>> >>> Thanks, >>> Dan Kulinski >>> >>> >>> >> _______________________________________________ >> Lustre-discuss mailing list >> [email protected] >> http://lists.lustre.org/mailman/listinfo/lustre-discuss > > _______________________________________________ > Lustre-discuss mailing list > [email protected] > http://lists.lustre.org/mailman/listinfo/lustre-discuss _______________________________________________ Lustre-discuss mailing list [email protected] http://lists.lustre.org/mailman/listinfo/lustre-discuss
