High Availability Strategies for InterSystems Caché, Ensemble, and HealthShare Foundation

Introduction

This document is intended to provide a survey of various High Availability (HA) strategies that can be used in conjunction with InterSystems Caché, Ensemble, and HealthShare Foundation. This document also provides an overview of the various types of system outages that can occur, as well as how each strategy would handle a given outage, with the goal of helping you choose the right strategy for your specific deployment.

The strategies surveyed in this document are based on three different HA technologies:

• Operating System Failover Clusters
• Virtualization-Based HA
• Caché Database Mirroring