Porting a large system to Unix

[Charles Blair]

My group is administering a large database on an Amdahl 5860 running
MVS/XA. The system resides on seven 3380 diskpacks; a 3380 holds about
1.2 gigs. Our two largest files are over 2 gigs, and growing; these
files are spread over several disks.

Several hundred users access the database daily. Typically only a few
users are accessing the database simultaneously, but during peak
periods this number is as high as 25. About 65,000 transactions are
processed daily. Response times average slightly less than a second.

The system uses a PL/I host interface to the Model 204 database
manager.

The question came up whether and how successfully systems of this size
have been ported to run under Unix. For us, "success" would primarily
be measured in terms of response time -- keeping it as low as it is
now. We are interested in knowing whether currently it is feasibile
even to consider such a port.

Does anyone have pointers to such systems?  (I'd particularly like to
know what database manager was used.)

E-mail responses are preferred; thanks.

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