Cluster Configuration

For a cluster, which of the following two configs is better, and why?

1) multiple Dual Xeon 2.4GHz 2GB RAM servers with three drives on RAID 5
2) multiple Dual Xeon 2.4GHz 2GB RAM servers with one small hard drive for the OS, and one NAS

Both configs would do webhosting with Apache, PHP, and heavy MySQL on FreeBSD.

In Config 1, would it make much of a performance difference if I'm using SCSI or IDE for the RAID array?

In config 2, would it make much of a performance difference if I'm using SCSI or IDE for the NAS?

 

 

 

 

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