On Thu, 2003-05-22 at 18:35, Jesse Keating wrote: > So I'm R&D'ing a new SCSI raid server, and we're using ultra320 drives (15k > RPM) and looking at two possible raid cards. One is the Adaptec 2200s > ultra320 64bit raid card, the other is LSI's megaraid 320-2, which is also a > 2 channel ultra 320 64bit raid card. The problem is the performance of both > of these cards STINKS with the 2.4.20* kernels. At first, I thought it was a > RHL9 issue. hdparm -t on a 3drive raid5 array only gives ~40M/s rates in > RHL9. I installed RHL8 on the system, and the same test (hdparm -t) on the > same drives with the 2.4.18-27 kernel gives me ~150M/s. please use tiobench or such for benchmarking also check the /proc/sys/vm/*readahead* parameter files
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