[Info-vax] For sale: VAXstation 4000/90 128MB Fully Working and Tested

[Arne Vajhøj]

On 7/9/2022 9:50 PM, Dave Froble wrote:
> On 7/9/2022 9:42 PM, Arne Vajhøj wrote:
>> On 7/9/2022 8:25 PM, Bill Gunshannon wrote:
>>> On 7/9/22 19:42, Arne Vajhøj wrote:
>>>> On 7/3/2022 8:13 PM, Arne Vajhøj wrote:
>>>>> On 7/2/2022 8:26 AM, Bill Gunshannon wrote:
>>>>>> Very few of the important ones are migrating off and many of those
>>>>>> that do migrate into failures.
>>>>>
>>>>> Some succeed.
>>>>>
>>>>> And it accumulates.
>>>>
>>>> A recent case: Fedex.
>>>>
>>>> They are moving from Cobol/IBM mainframe/own data center
>>>> to "cloud native"/Azure & Oracle cloud.
>>>>
>>>> The CIO announced when this thread was going on that
>>>> they has already moved 80% of applications and that
>>>> the remaining 20% would all be done in 2024.
>>>>
>>>> He did not mention what "cloud native" covers,
>>>> but elsewhere it is revealed to be:
>>>> - Angular for client side
>>>> - Java and Spring Boot for applications
>>>> - kubernetes and docker for infrastructure
>>>>
>>>> Which is not really surprising. In the 1980's nobody got fired
>>>> for choosing IBM. Today nobody get fired (in a large conservative
>>>> company) for choosing above stack.
>>>
>>> There has been some talk of this in Mainframe groups.  Can't wait to see
>>> how it turns out.
>>
>> With 80% completed and the last 20% in progress, then it
>> seems like a done thing.
> 
> We in the homebuilt aircraft have a saying.
> 
> 90% done, 90% to go.
> 
> All too often it's true.

There is a big difference between:
- 80% of the estimated work for porting an application
   is done
and:
- 80% of applications migrated, the old servers
   they run on is shutdown and hauled out and production
   running in the new environment

Experience show that the first has a significant risk
of going over estimate.

But for the second what is running is running and
risk is reduced to the remaining stuff.

 > So I wonder, why isn't that last 20% also done?  Perhaps it doesn't work
 > so well in the cloud.  Or with the new languages.  Or the new developers.

You don't start migrating everything in parallel.

You move chunks at a time.

Arne