sbd_io_cnt
sbd_io_cnt(hp, devset) + sbd_mem_cnt(hp, devset);
ncm = sbd_cpu_cnt(hp, devset) + sbd_io_cnt(hp, devset) +
ncm = sbd_cpu_cnt(hp, devset) + sbd_io_cnt(hp, devset) +
int sbd_io_cnt(sbd_handle_t *, sbd_devset_t);