[lustre-discuss] Do not recreate OST objects on OST replacement

Degremont, Aurelien degremoa at amazon.com
Tue Sep 10 09:23:20 PDT 2019


When an OST dies and you have no choice but replacing it with a newly freshly formatted one (using mkfs --replace), Lustre runs a resynchronization mechanisms between the MDT and the OST.
The MDT will sent the last object ID it knows for this OST and the OST will compare this value with its own counter (0 for a freshly formatted OST).
If the difference is greater than 100,000 objects, it will recreate only the last 10,000, if not, it will recreate all the missing objects.

I would like it to avoid recreating any objects. The missing ones are lost and just start recreating new ones. Is there a way to achieve that?



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