I'm wondering if anyone has heard of this. I've a system with a 3ware 9650 servicing 4 7200RPM Segate 1TB drives and the motherboard servicing 2 7200 RPM Segate 1TB drives.
The 4 disk array is RAID 6 while the 2 disk array is RAID 1. The drives should deliver about 100MB/s. 1. The most the 4 disk array is developing is 250MB/s write performance while the 2 disk array is coming in at 90MB/s write performance. The 4 disk array seems slow. 2. Attempting to write to both arrays simultaneously causes the rate on the 4 disk array to drop to 150MB/s and the 2 disk array drops to 60MB/s I'd expect the 4 disk array should look more like 300+MB/s while the 2 disk array is about right. I don't get why there should be a 'coupling' between the rates on separate controllers. The system is running FreeBSD 8.0, has 16GB of RAM in the system, and the test program is using O_DIRECT for writes in order to avoid the page daemon. Thanks _______________________________________________ freebsd-performance@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-performance To unsubscribe, send any mail to "freebsd-performance-unsubscr...@freebsd.org"