Hello. Just for your information,and because I was curious, I tried the following test on several raid5 systems around here. dd if=/dev/zero of=test bs=64k count=100000
NetBSD-4.x with softdep enabled came in with a write speed of about 9.8mbytes/sec. NetBSD-5.1 on FFSv2 without softdep or wapbl came in with a write speed of about 8mbytes/sec. The read speed on both installations was above 200mbytes/sec. Another test I might suggest is looking at the output of iostat -D when you're trying to do these really slow writes. If the disks show 100% busy during these writes, that suggests a problem with the controller or the disks. If not, then there's a software problem in the OS somewhere. -Brian