Performance Availability Clusters (PACs)

Supported Operating Systems

The following platforms are supported:

Windows
x86-64 running Red Hat Linux 7.3 or 7.4
x86-64 running on SUSE v12 SP2

Operating System Dependencies

On Linux platforms, the scale-out features require the latest version of the libuuid library.

To install on SUSE, at the command prompt, type the following:

zypper search libuuid

Follow the prompts and only install the non-development packages.

To install on Red Hat, at the command prompt, type the following:

yum search libuuid

Follow the prompts to install the packages.

RDBMS Support

The PAC requires a supported RDBMS to manage the following databases:

Region database (mandatory)
Cross-region database (mandatory)
Datastore database(s) (optional)

A datastore database should be used to manage VSAM files using the Micro Focus Database File Handler support.

Windows

Database	ODBC Driver
Microsoft SQL Server 2008 (including Express editions) R2 and later	ODBC 13.1 for SQL Server
PostgreSQL 10.x (incl. Amazon Aurora Postgres) and later	psqlodbc 11
DB2 10.5 and later	n/a

Note: These are databases supported for database hosted VSAM files. See Additional Software Requirements on Windows and Additional Software Requirements for Micro Focus Enterprise Developer UNIX Components for more information on CICS SQL supported databases.

UNIX

Database	ODBC Driver
Microsoft SQL Server 2017 (including Express editions) and later	ODBC 13.1 for SQL Server Note: SQL Server 2017 installs versions 13 and 17 (x64 only)
PostgreSQL 10.x and later	psqlodbc 11
DB2 10.5 and later	n/a

Note: The Micro Focus Native Database File Handler is only supported on x86-64 running Red Hat Linux 7.3 or 7.4 or x86-64 running on SUSE v12 SP2 as these are also the minimum requirements for Microsoft SQL Server 2017.

In addition, there are minimum requirements for the following components:

Component	Version
Driver manager (MSSQL and PostgreSQL installations only)	unixODBC 2.3.2

Current Limitations

The order in which duplicate keys are returned is not guaranteed for indexed files. For files stored on disk, duplicate keys are always returned in the order they were written in.
The supported key types are currently limited to alphanumeric, binary, and numeric.
PostgreSQL does not support EBCDIC collating sequences. See Configure Datastores for Db2 for more information.
MFDBFH does not support COBOL programs compiled with NOFCD3.

NoSQL Support for Scale-Out Repository

Enterprise Server must use a NoSQL database as a , a requirement to maintain PAC integrity. Enterprise Server supports the following NoSQL databases:

Redis: An open source in-memory data structure store.
Redis Cluster: A distributed implementation of Redis with performance, scalability, and availability as part of its design.
Redis Sentinel: Provides Redis high availability.

For a production environment, Micro Focus recommends using an enterprise-ready Redis server that supports Redis 5.0.3 to 6.0. [2]

For more information on Redis click here.

To facilitate development only, an Open Source version of Redis is supplied with the development product. Visual COBOL for Windows and UNIX, ships with a version of Redis.

Note: The Windows version of Redis that is shipped with Visual COBOL is for testing purpose only and is not intended for use in a production environment. For a production environment, Micro Focus recommends using an Enterprise-ready Redis compatible NoSQL database run on Linux or Windows, as required. The open-source Redis provided with the product can only be used in a UNIX environment.

To start the Redis server for Windows environments, start a Visual COBOL Command Prompt, and then type:

%ProgramFiles(x86)%\Micro Focus\Visual COBOL\AdoptRedis\redis-server.exe

Note: This starts the Redis server on the default port 6379.

Redis high availability can be achieved by using Redis Sentinel.