CALC_PERCENT_VS
percent_reads = CALC_PERCENT_VS(counter.aio_read_cnt + counter.raid_read_cnt,
percent_aio = CALC_PERCENT_VS(counter.aio_read_cnt + counter.aio_write_cnt,
percent_aio = CALC_PERCENT_VS(counter.aio_read_cnt, counter.raid_read_cnt);
percent_aio = CALC_PERCENT_VS(counter.aio_write_cnt, counter.raid_write_cnt);
percent_aio = CALC_PERCENT_VS(counter.aio_non_read_write, counter.raid_non_read_write);