Keld Jørn Simonsen wrote: > 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 Not on this machine, but yes, I am planning to do something like this on my workstation. I need to get my drives/arrays in order first (got bitten by the 7200.11 fiasco). -- 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
