if you have tons of ram how important is hard disk speed?

I was just wondering if running a redhat server with zeus web server, if you have tons of ram since its so cheap is hard disk speed really important if everything should be able to be in ram?

And does anybody think that 7200 rpm scsi 2 hard disks are fast enough for a situation like this and wouldn't cause web speed when surfing pages on the box?

I feel ok about my box but never really understood the ram thing. Allot of hosting solutions actually have tons of space compared to the amount of ram being used and in these situations the server is probably constantly swapping loading files back and forth. But if you don't have much data and excess ram isn't everything in ram and ready for us and thus is speedier and allows the hard drives to rest more?

 

 

 

 

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