>Scenario: A given SQL server has all data and log files on an external disc array (including master and msdb data and log files). The server fails. A new server is stood up, and the external array is connected to it. How is SQL installed to point to the existing master and msdb files??
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>What are the disadvantages of setting it up this way?
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>Could / Should SQLs other internal files be installed on the external array as well (i.e. none of SQL on the C drive but all external)??
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>All help is greatly appreciated.


Why you need to mess with system files? Can't you just copy your DBs and then attach them to new instance?
I am pretty sure that SQL Server can not access DataBases which not reside on the same computer where it is installed, and I think this is right, because somethimes external drives can't be accessible (networks fails, other computer is not turned on etc.).