[ceph-users] Ceph benchmark tool (cbt)

Hi all, I want to benchmark my production cluster with cbt. I read a bit of the code and I see something strange in it, for example, it's going to create ceph-osd by it selves ( https://github.com/ceph/cbt/blob/master/cluster/ceph.py#L373) and also shutdown the whole cluster!! ( https://github.com/ceph/cbt/blob/master/cluster/ceph.py#L212) Is there any configuration to not do harmful things with the cluster and for example just test the read_ahead_kb or simply stop some OSDs and other things that can be reverted and not get the cluster fully down?! Thanks.