On Mon, Jan 19, 2009 at 03:10:01AM -0500, thomas62186218@xxxxxxx wrote: > > I tested RAID 5 and RAID 6 with 12 x 15K SAS drives on Ubuntu 8.04 > 64-bit and found their performance to be about the same. I used 256 K > chunk size, v1.0 superblocks, stripecachesize of 16384, and readahead > of 65536. > > RAID 5 reads: 774 MB/sec > RAID 5 writes: 585 MB/sec > > RAID 6 reads: 742 MB/sec > RAID 6 writes: 559 MB/sec > > My CPU utilization remains under 10% though during writes, and I'm > wondering what can be done to get write performance closer to read > performance. I have dual quad-core CPUs so there's plenty of CPU to go > around. Any ideas on that front? Seems like it is the same equipment that you also did the raid10,f2 tests for. I think it would be interesting to have a consolidated list of performance comparisons, when you have completed your tweakings. Is that part of your plan? best regards keld -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
