OVMS to Unix migration

[Merol Newman]

Why such madness?

I work on PH software on both VMS and Unix. I must admit I know nothing
about emulators, but as far as I am aware, all your DCL stuff will have to
be completely rewritten, and the Unix equivalent is much less intuitive.

There will be very little trouble with Powerhouse. The main difference will
be that record 1 in VMS is record 0 in Unix, and if you call programs in other
directories, the logicals have a different format. Unix is also case-sensitive
for commands outside PH.

RMS should convert to C-ISAM easily enough, but remember C-ISAM has separate
.dat and .idx files (.dat, .idx and .sfd for indexed subfiles rather than
having the index within the data file, and there is no .fdl for converting
and reorganising files. You always have to unload and reload after a file
format change.

Relational database will probably require only a few standardised code
changes to run, but needs more care to give you the full benefits. It also
requires a lot of system management compared to indexed files.

I am obviously very biased, so I hope you will get other replies from the
other side to help you make a good decision.

 
Merol Newman
E-mail: meroln@specialist.co.uk <mailto:meroln@specialist.co.uk>


> -----Original Message-----
> From: owner-powerh-l@sphere.swau.edu
> [mailto:owner-powerh-l@sphere.swau.edu]On Behalf Of Scroggins, Tom
> Sent: 18 April 2000 20:15
> To: powerh-l@lists.swau.edu
> Subject: OVMS to Unix migration
>
>
> We are investigating migrating our current PH application from an OVMS box to
> Unix.  At a recent conference a collegue had several discussions with people
> who had gone through similar migrations.  Does anyone out there have
> documentation on steps for migrating?  Several items we need to address:
>
> - We have lots of DCL.  I have to assume that it is better to emulate than try
> to recode everything.
> - We use RMS.  All of our data is in RMS files.  How much is lost by going
> with RMS emulators?  What about migrating to an RDB?
> - How much other functionality is lost?
> - What about recompiling existing PH code?  Painful?  Easy?
>
> Any information would be appreciated.
>
> Thank you,
> Tom Scroggins
>
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