d, err := newWarmBackend(ctx, tier, true)
	if err != nil {
		return err
	}

	if !ignoreInUse {
		// Check if warmbackend is in use by other MinIO tenants
		inUse, err := d.InUse(ctx)
		if err != nil {
			return err
		}
		if inUse {
			return errTierBackendInUse
		}
	}

	config.Tiers[tierName] = tier
	config.drivercache[tierName] = d

	return nil
}