On Thu, 12 Oct 2006 at 4:22pm, Bowie Bailey wrote > I have two identical servers. The only difference is that the first > one has Maxtor 250G drives and the second one has Seagate 320G drives. > > OS: CentOS-4.4 (fully patched) > CPU: dual Opteron 280 > Memory: 16GB > Raid card: 3ware 9550Sx-8LP > Raid volume: 4-disk Raid 5 with NCQ and Write Cache enabled > > On the first server I have decent performance. Nothing spectacular, > but good enough. The second one has about 1/3 the write speed. I > can't find any difference between the systems. Both of them have the > same stripe size, both have ext3 filesystems, both have write caching > and NCQ turned on. I have already increased the read ahead setting to > 16384 on both servers. Turn off NCQ. Last I knew, this was still 3ware's recommendation. -- Joshua Baker-LePain Department of Biomedical Engineering Duke University