Require hard data on performance issues (correct email addr on this one)

The scenario is running Informix on a raid 5 verses a non raid system system. (Solaris 7 x86 OS) Could ~anyone~ point me to resources where there have been benchmarks run showing how much of a performance hit you take utilizing raid 5 compared to a non raid system?? And on a slightly different tack, are there any benchmarks showing performance gains using raw verses cooked file systems? -- again, reports rather then "it's quicker" TIA Peter W.