[Info-vax] VSI strategy for OpenVMS

[Dave Froble]

On 9/16/2021 7:42 PM, Arne Vajhøj wrote:
> On 9/16/2021 5:10 PM, Dave Froble wrote:
>> On 9/16/2021 2:45 PM, Arne Vajhøj wrote:
>>> On 9/15/2021 1:00 AM, Phillip Helbig (undress to reply) wrote:
>>>> In article <shr7f4$tnu$1 at gioia.aioe.org>, =?UTF-8?Q?Arne_Vajh=c3=b8j?=
>>>> <arne at vajhoej.dk> writes:
>>>>>>> Businesses are interested in application availability. They
>>>>>>> do not care whether that is provided by OS features or
>>>>>>> application features.
>>>>>>
>>>>>> They should care if they have to hire twice as many people to
>>>>>> implement
>>>>>> the non-VMS solution.
>>>>>
>>>>> But why should they need to hire more people??
>>>>>
>>>>> Let us take Rdb vs Oracle DB aka Classic with RAC (real RAC
>>>>> not RAC One). Both use a DLM but Rdb use VMS DLM while Oracle DB
>>>>> RAC use its own DLM.
>>>>>
>>>>> Does it matter for developers or operations? Not really.
>>>>
>>>> Have you ever worked anywhere where one tried to emulate the
>>>> functionality of VMS with regard to clustering, availability, and so on
>>>> with non-VMS hardware and software?
>>>
>>> It was a very specific example where the same functionality is provided
>>> by either DLM in the application or in the OS.
>>>
>>> I don't see why it would require more people to manage when
>>> it is in the application.
>>
>> If it's in the application, who puts it there and maintains it?
>>
>> If it's in the OS, the required people for maintenance is zero.
>
> I cannot follow you.
>
> If we look at the stacks:
>
>                           Rdb        Oracle RAC
> business application      X          X
> RDBMS                     Oracle     Oracle
> DLM                       VSI        Oracle
> OS                        VSI        whoever
>
> The difference is that some work get moved from OS vendor to Oracle.
>
> But Oracle is probably not unhappy about that, because the
> cost of maintaining the DLM is offset by the savings from
> having the same DLM API across OS'es.
>
> Arne

Ok, you're right to some extent, since the thread mentioned Rdb and Oracle.

But how about in-house custom developed applications?

Either one can use what's available, or, one must implement the locking 
in the application.

-- 
David Froble                       Tel: 724-529-0450
Dave Froble Enterprises, Inc.      E-Mail: davef at tsoft-inc.com
DFE Ultralights, Inc.
170 Grimplin Road
Vanderbilt, PA  15486