From: arne@vajhoej.dk
On 8/16/2025 6:46 PM, Waldek Hebisch wrote:
> Arne Vajhøj wrote:
>> It would not make sense for Oracle to port if they expect
>> customers to migrate away in a few years.
>>
>> And it would not make sense for customers to move to x86-64
>> and migrate away in a few years.
>
> Why not? Succesful platform migration may take a lot of time.
> When migration is done in incremental way important part is
> increasing portability of source code. During that production
> runs on existing system, in this case VMS. Assuming that x86-64
> part is succesful, that is VSI customers can easily move
> software to x86-64 VMS, it make sense to use x86-64 as intermedite
> step. Namely, one has gain on hardware side, that is ability to
> retire old hardware and run on new one. And move to x86-64 can
> test some aspects of migration, before it is fully done.
If they were to migrate it would be lower cost to stay
on Itanium and just do one migration instead of two. From
VMS Itanium to VMS x86-64 may not require any code changes, but
planning, project management, test etc. still make it expensive.
Any incremental increase of code portability could just as
well be done on Itanium. Unless support for newer C++ standards
is important.
> Also, customer using Rdb now and migrationg to x86-64 may plan
> migration off Rdb to a different database while staying on VMS.
Keeping application on VMS and having it access PostgreSQL or
MySQL database on Linux would certainly be an option.
> OTOH, I would not expect much sense in platform choices. Migration
> off VMS may be triggered by retirement of VMS-proponent or promotion
> of VMS-enemy. There could be IT personel who wants to deal with
> popular platforms and at some more or less random time management
> may follow reccomendation given by IT personel.
There is always a certain uncertainty/randomness due to
human nature.
Arne
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