Max checkpoint size computation large error on big clusters

cb::engine_errc KVBucket::setCheckpointMaxSize(size_t size) {

    if (size > 0) {

        checkpointMaxSize = size;

        return cb::engine_errc::success;

    }

    // Note: This is NOT perfect in the general case.

    // VBMap::getSize() returns the capacity of the VBMap, not the actual number

    // of vbuckets in the map. For perfect sizing we would need to recompute

    // at any vbmap size change (ie, bucket creation / deletion). @todo MB-48038

    const auto numVBuckets = vbMap.getSize();

    const auto& config = engine.getConfiguration();

    const auto checkpointQuota = config.getMaxSize() * checkpointMemoryRatio;

    const auto numCheckpointsPerVB = config.getMaxCheckpoints();

    Expects(numVBuckets > 0);

    Expects(numCheckpointsPerVB > 0);

    checkpointMaxSize = (checkpointQuota / numVBuckets) / numCheckpointsPerVB;

    return cb::engine_errc::success;

}