Monday, April 30, 2007
Grieg re-testing DPM 1.6.3 rfio
Thanks to Greig for retesting our DPM 1.6.3's rfio.
The good news is that the code changes from 1.5.10 drastically reduce the number of rfio_open() failures. These now only crop up at about 70 clients (all within 1 second). The average open time is also much more stable, never rising above 2.5s.
However, we now see a problem with io wait on the disk server, and the total LAN rate struggles to reach 200MB/s, where as 1.5.10 easily reached 400Mb/s.
This remains to be investigated, but the only change on the disk servers is the update of DPM version, so I think it must be a DPM issue.