Regarding RAID we had to learn that out of five disks in
one night two of the disks had a failure - resulting in
an unplanned outage of the affected server (although it
was not an ADSM server).

If You want to go for RAID, then I would suggest to replace
each single disk with a single RAID array - but not a couple
of disks with one RAID array.

Best regards

Andreas Peikert, Systems Programmer
   aMaDEUS Data Processing GmbH
   P.O. Box,   D-85424 Erding,   Germany
   Fon: +49 (0)8122 43-5805
   Fax: +49 (0)8122 43-3260
   email: apeikert AT amadeus DOT net

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