I have 2 DELL PowerEdge 2900 servers with PERC6i (RAID) controllers. Both servers have 2 HDDs in a RAID-1 mirror for the O/S.

Server A uses 6 WD 7200RPM RE3 1TB drives in a RAID-5 array for data and runs fine.

Server B uses 6 WD 10K RPM Velociraptor 300GB drives in a RAID-10...