Whether RH3 supports that SATA is a question of the kernel they use,
you'll need to look that up on their support site (one of the reasons
you pay for RedHat, no? ;}).... as for the mirroring: it can be done
using md tools, but I wouldn't think it's advisable to use different
models (with different performance) in a mirror.
That said: personally I'd suggest a set-up with more spindles for
oracle, depending on how intense the usage is you should be looking
at having tablespace, indices and redo-logs on a separate spindle
each. If your data is mission-critical I'd go for a solution with
6 mirrored SCSI disks minimum.
Cheers,
Tink
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