[Info-vax] Distributed Applications, Hashgraph, Automation

[Stephen Hoffman]

On 2018-02-16 03:15:48 +0000, Kerry Main said:


> mission critical proven DLM,

Handy, definitely.   In competitive configurations, other DLMs exist.

>  cluster logicals,

Or as is commonly used on various other platforms, LDAP.   
https://directory.apache.org/apacheds/ or VSI Enterprise Directory, or 
otherwise.

> cluster batch,

Batch is not competitive as scheduling offerings goes.  It's a pain in 
the rump, in practice.   Third-party scheduling offerings for OpenVMS, 
and other configurations on other platforms have vastly better 
offerings.  Hadoop YARN or Mesos, etc.

> common file system (new one with significant new features cooking as well).

The new file system is comparatively old, unfortunately.   We're 
clearly headed toward in-memory processing and byte-addressable 
non-volatile storage too, and not toward main processing using HDD or 
SSD storage, save as archival and recovery and overflow.

> However, the industry really only looks at shared disk or shared nothing.
> 
> Btw, the modern day equivalent to memory channel and ultra low latency 
> data sharing is either Infiniband or RoCEv2 (RDMA over converged 
> ethernet)
> 
> Not sure where it is at right now, but RoCEv2 is on the research slide 
> of the OpenVMS roadmap.
> 
> Imho, this type of cluster communications capability is critical to 
> next generation cluster scalability of shared disk clusters.  It is how 
> VSI can address the biggest counter argument to shared disk clusters - 
> "shared disk clusters have scalability issues due to the requirement of 
> a distributed lock manager"

In terms of features and capabilities provided, RDMA is a 
next-generation cluster interconnect and not a next-generation cluster.





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