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Yes, but there's a few more steps. The full procedure is documented in the manual:If my directory-container stgpool crash, how do I restore my stgpool?
Do I use repair stgpool to recovery?
You would need more than 20 TB, because it's recommended to leave at least 20% free space in a directory container pool so that new backups can be stored and also space reclaimed with move containers, neither of these things can happen if you just configure the bare minimum. You also end up with an uneven pool and poor performance is you build it the strict minimum and then can adding directories later one at a time. It's best to configure it with sufficient directories on day 1.when I repair , new directory-container stgpool need 20TB?