I have a poweredge 2500 with the Dell Perc 3 /DI RAID controller with 3 18gB drives configured in a RaiD 5 setup and another 3 146gb drives set up in another RAID 5 configuration plus a 250gB SATA drive set up on a secondary PCI IDE controller. The machine has dual 1.4GHz P3s in it with 1.2Gb RAM. The 3 18gb drives make up my storage for the operating system and pagefile. All the drives were low level formatted prior to installing any SW and checked out fine. This is a new DC in my network and I have had it running on a stand alone subsegment for about 2 weeks as I get it configured and burned in. I am running windows advanced server 2003 with all the latest SPs. I am getting delayed write errors to my RAID container with the operating system on it. Any ideas whether this is likely a HW or a SW issue? Any suggestions of additional diagnistics I can run to pinpoint the problem?