High Availability Requirements for Mainframe Data Modernization — Running tcVISION in Global Availability Zones

by Joseph Brady, Director of Business Development / Cloud Alliance Lead at Treehouse Software, Inc.

Many customers embarking on Mainframe-to-Cloud data replication projects with Treehouse Software are looking at high availability (HA) as a key consideration in the planning process. The goal with HA is to ensure that systems are always functioning and accessible, with deployments located in various Availability Zones (AZs) worldwide. Having an HA architecture in place protects against data center, availability zone, server, network, and storage subsystem failures to keep businesses running without downtime or human intervention.

In this blog, we will give a high-level overview of tcVISION HA Architecture, using AWS as an example. However, HA basic principles are essentially the same across all Cloud platforms.

Example of the tcVISON HA Architecture on AWS

During tcVISION’s Change Data Capture (CDC) processing for Mainframe-to-Cloud data replication, HA must be maintained in the AWS environment. The Amazon Elastic Compute Cloud (Amazon EC2), which contains the tcVISION Manager, is part of an Auto Scaling Group that is spread across AZs with Amazon EC2 instance(s).


Upon failure, the replacement Amazon EC2 instance tcVISION Manager is launched and communicates its IP address to the mainframe tcVISION Manager. The mainframe tcVISION Manager then starts communication with the replacement Amazon EC2 tcVISION Manager.

Once the Amazon EC2 tcVISION Manager is restarted, it continues processing at its next logical restart point, using a combination of the LUW and Restart files. LUW files contain committed data transactions not yet applied to the target database. Restart files contain a pointer to the last captured and committed transaction and queued uncommitted CDC data. Both file types are stored on a highly available data store, such as Amazon Elastic File System (EFS).

For production workloads, Treehouse Software recommends turning on Multi-AZ target and metadata databases.

To keep all the dynamic data in an HA architecture, tcVISION uses EFS, which provides a simple, scalable, fully managed elastic file system for use with AWS Cloud services and on-premises resources. It is built to scale on-demand to petabytes without disrupting applications, growing and shrinking automatically as you add and remove files, eliminating the need to provision and manage capacity to accommodate growth.

Treehouse Software can help organizations immediately start moving their mainframe data to the Cloud and take advantage of the most advanced, scalable, secure, and highly available technologies in the world with tcVISION


tcVISION supports a vast array of integration scenarios throughout the enterprise, providing easy and fast data migration for mainframe application modernization projects and enabling bi-directional data replication between mainframe, Cloud, Open Systems, Linux, Unix, and Windows platforms.

View the Unequalled List of Environments Supported by tcVISION Here


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Contact Treehouse Software for a Demo Today…

Just fill out the Treehouse Software Product Demonstration Request Form and a Treehouse representative will contact you to set up a time for your tcVISION demonstration. This will be a live, on-line demonstration that shows tcVISION replicating data from the mainframe to a Cloud target database.

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