The following results were achieved during measurements with 12 tasks on 6 volumes, using FastDPAV with 6 base davices and 6 alias devices. Hence, for each task one free base and alias devices was available. First measurements were conducted using only 1 channel path. For the second measurement run with the same load, another channel path was added.
Channels | Vol. | Tasks | seq. read | seq. write | random25 | |||
IO/s | Mbyte/s | IO/s | Mbyte/s | IO/s | Mbyte/s | |||
1 | 6 | 12 | 27,603 | 1,015 | 27,060 | 1,299 | 27,230 | 1,200 |
2 | 6 | 12 | 43,923 | 2,012 | 38,070 | 2,037 | 42,262 | 2,085 |
With 2 channel paths, the throughput and IO rates are significantly higher than with only one. They aren't doubled, as also the IO system of the SU /390 and the storage system limit the performance.
However, depending upon the particular application scenario, IO performance can be increased by connecting further channels.