Question about how rebuild works.

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I have a question about rebuild in the following situation:

I have a pool with 3x replication.
For one particular PG we'll designate the active OSD set as [1,2,3] with 1 as the primary.
Assume 2 and 3 crash with a TOTAL loss of local data.
2 restarts, fiddles about and then start the backfill process.
<A little time passes, here little means enough to make some progress in the rebuild process but nowhere near enough to complete it.
3 restarts, fiddles about then starts the backfill process.

My question: Is there any optimization of the fact that we're rebuilding 2 OSDs at the same time (even though the rebuilds didn't start in lock step) OR do the two rebuilds continue independently??


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