Thanks for all your replies! They are enlightening. I have some additional questions:

1) Would you prefer
   a) 5.4k 2" SATA RAID10 on four disks or
   b) 10k 2" SAS RAID1 on two disks?
(Remember the lots (!) of random reads)

2) Should I just make one large partition of my RAID? Does it matter at all?

3) Will I gain much by putting the OS on a saparate disk, not included in the RAID? (The webserver and database would still share the RAID - but I guess the OS will cache my (small) web content in RAM anyway).

Thanks again!

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