[Info-vax] VSI strategy for OpenVMS

[Arne Vajhøj]

On 9/17/2021 4:33 PM, Stephen Hoffman wrote:
> On 2021-09-17 00:04:09 +0000, Dave Froble said:
> 
>> ...But how about in-house custom developed applications?
>>
>> Either one can use what's available, or, one must implement the 
>> locking in the application.
> 
> Most current server platforms either have an integrated DLM, or have one 
> available.
> 
> https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/html/high_availability_add-on_overview/ch-dlm 
> 
> https://documentation.suse.com/sle-ha/12-SP5/html/SLE-HA-all/cha-ha-storage-dlm.html 

DLM is available in many OS.

But most applications needing to sync between multiple active nodes:
* Oracle RAC
* DB2 PureSCale
* varios NoSQL (Voldemort, MongoDB, Cassandra, HBase)
* various distributed cache (Hazelcast, Infinispan, Ignite, mecached, Redis)
use non-OS features to do it.

> Or the app locking requirements can become database package 
> requirements, and whether the chosen database was running locally, or 
> was distributed.
> 
> When many (most?) existing OpenVMS apps were designed and written, the 
> computing world was a very different place.

Very true.

Most applications leave that sort of functionality to
let us call it platform software.

Above are a list of some software that works with
data in active/active configs.

Arne