Re: How to add 100 new OSDs...

[Reed Dier <reed.dier@xxxxxxxxxxx>]

Just chiming in to say that this too has been my preferred method for adding [large numbers of] OSDs.

Set the norebalance nobackfill flags.

Create all the OSDs, and verify everything looks good.

Make sure my max_backfills, recovery_max_active are as expected.

Make sure everything has peered.

Unset flags and let it run.

One crush map change, one data movement.

Reed

That works, but with newer releases I've been doing this:

- Make sure cluster is HEALTH_OK
- Set the 'norebalance' flag (and usually nobackfill)
- Add all the OSDs
- Wait for the PGs to peer. I usually wait a few minutes
- Remove the norebalance and nobackfill flag
- Wait for HEALTH_OK

Wido

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